diff --git a/frontend/rust-lib/flowy-revision/src/conflict_resolve.rs b/frontend/rust-lib/flowy-revision/src/conflict_resolve.rs
index 8b36d554cd..afb8379631 100644
--- a/frontend/rust-lib/flowy-revision/src/conflict_resolve.rs
+++ b/frontend/rust-lib/flowy-revision/src/conflict_resolve.rs
@@ -10,7 +10,7 @@ use flowy_sync::{
 };
 use lib_infra::future::BoxResultFuture;
 use lib_ot::core::{Attributes, Delta, PhantomAttributes};
-use lib_ot::rich_text::RichTextAttributes;
+use lib_ot::rich_text::TextAttributes;
 use serde::de::DeserializeOwned;
 use std::{convert::TryFrom, sync::Arc};
 
@@ -30,7 +30,7 @@ pub trait ConflictRevisionSink: Send + Sync + 'static {
     fn ack(&self, rev_id: String, ty: ServerRevisionWSDataType) -> BoxResultFuture<(), FlowyError>;
 }
 
-pub type RichTextConflictController = ConflictController<RichTextAttributes>;
+pub type RichTextConflictController = ConflictController<TextAttributes>;
 pub type PlainTextConflictController = ConflictController<PhantomAttributes>;
 
 pub struct ConflictController<T>
@@ -175,7 +175,7 @@ where
     }
 }
 
-pub type RichTextTransformDeltas = TransformDeltas<RichTextAttributes>;
+pub type RichTextTransformDeltas = TransformDeltas<TextAttributes>;
 
 pub struct TransformDeltas<T>
 where
diff --git a/frontend/rust-lib/flowy-text-block/src/editor.rs b/frontend/rust-lib/flowy-text-block/src/editor.rs
index 2649b2bae1..ccbfe3d694 100644
--- a/frontend/rust-lib/flowy-text-block/src/editor.rs
+++ b/frontend/rust-lib/flowy-text-block/src/editor.rs
@@ -15,7 +15,7 @@ use flowy_sync::{
 };
 use lib_ot::{
     core::{Interval, Operation},
-    rich_text::{RichTextAttribute, RichTextDelta},
+    rich_text::{RichTextDelta, TextAttribute},
 };
 use lib_ws::WSConnectState;
 use std::sync::Arc;
@@ -85,7 +85,7 @@ impl TextBlockEditor {
         Ok(())
     }
 
-    pub async fn format(&self, interval: Interval, attribute: RichTextAttribute) -> Result<(), FlowyError> {
+    pub async fn format(&self, interval: Interval, attribute: TextAttribute) -> Result<(), FlowyError> {
         let (ret, rx) = oneshot::channel::<CollaborateResult<()>>();
         let msg = EditorCommand::Format {
             interval,
diff --git a/frontend/rust-lib/flowy-text-block/src/queue.rs b/frontend/rust-lib/flowy-text-block/src/queue.rs
index e48c39fb97..b9a98f1529 100644
--- a/frontend/rust-lib/flowy-text-block/src/queue.rs
+++ b/frontend/rust-lib/flowy-text-block/src/queue.rs
@@ -13,7 +13,7 @@ use flowy_sync::{
 use futures::stream::StreamExt;
 use lib_ot::{
     core::{Interval, OperationTransform},
-    rich_text::{RichTextAttribute, RichTextAttributes, RichTextDelta},
+    rich_text::{RichTextDelta, TextAttribute, TextAttributes},
 };
 use std::sync::Arc;
 use tokio::sync::{oneshot, RwLock};
@@ -194,7 +194,7 @@ impl EditBlockQueue {
 pub(crate) struct TextBlockRevisionCompactor();
 impl RevisionCompactor for TextBlockRevisionCompactor {
     fn bytes_from_revisions(&self, revisions: Vec<Revision>) -> FlowyResult<Bytes> {
-        let delta = make_delta_from_revisions::<RichTextAttributes>(revisions)?;
+        let delta = make_delta_from_revisions::<TextAttributes>(revisions)?;
         Ok(delta.json_bytes())
     }
 }
@@ -229,7 +229,7 @@ pub(crate) enum EditorCommand {
     },
     Format {
         interval: Interval,
-        attribute: RichTextAttribute,
+        attribute: TextAttribute,
         ret: Ret<()>,
     },
     Replace {
diff --git a/frontend/rust-lib/flowy-text-block/src/web_socket.rs b/frontend/rust-lib/flowy-text-block/src/web_socket.rs
index a44214f4f2..e4919b917a 100644
--- a/frontend/rust-lib/flowy-text-block/src/web_socket.rs
+++ b/frontend/rust-lib/flowy-text-block/src/web_socket.rs
@@ -10,8 +10,8 @@ use flowy_sync::{
     errors::CollaborateResult,
 };
 use lib_infra::future::{BoxResultFuture, FutureResult};
-use lib_ot::rich_text::RichTextAttributes;
 use lib_ot::rich_text::RichTextDelta;
+use lib_ot::rich_text::TextAttributes;
 use lib_ws::WSConnectState;
 use std::{sync::Arc, time::Duration};
 use tokio::sync::{
@@ -111,7 +111,7 @@ struct TextBlockConflictResolver {
     edit_cmd_tx: EditorCommandSender,
 }
 
-impl ConflictResolver<RichTextAttributes> for TextBlockConflictResolver {
+impl ConflictResolver<TextAttributes> for TextBlockConflictResolver {
     fn compose_delta(&self, delta: RichTextDelta) -> BoxResultFuture<DeltaMD5, FlowyError> {
         let tx = self.edit_cmd_tx.clone();
         Box::pin(async move {
diff --git a/frontend/rust-lib/flowy-text-block/tests/editor/mod.rs b/frontend/rust-lib/flowy-text-block/tests/editor/mod.rs
index bbfd1da6f8..8f2921d203 100644
--- a/frontend/rust-lib/flowy-text-block/tests/editor/mod.rs
+++ b/frontend/rust-lib/flowy-text-block/tests/editor/mod.rs
@@ -8,7 +8,7 @@ use derive_more::Display;
 use flowy_sync::client_document::{ClientDocument, InitialDocumentText};
 use lib_ot::{
     core::*,
-    rich_text::{RichTextAttribute, RichTextAttributes, RichTextDelta},
+    rich_text::{RichTextDelta, TextAttribute, TextAttributes},
 };
 use rand::{prelude::*, Rng as WrappedRng};
 use std::{sync::Once, time::Duration};
@@ -127,11 +127,11 @@ impl TestBuilder {
             TestOp::InsertBold(delta_i, s, iv) => {
                 let document = &mut self.documents[*delta_i];
                 document.insert(iv.start, s).unwrap();
-                document.format(*iv, RichTextAttribute::Bold(true)).unwrap();
+                document.format(*iv, TextAttribute::Bold(true)).unwrap();
             }
             TestOp::Bold(delta_i, iv, enable) => {
                 let document = &mut self.documents[*delta_i];
-                let attribute = RichTextAttribute::Bold(*enable);
+                let attribute = TextAttribute::Bold(*enable);
                 let delta = document.format(*iv, attribute).unwrap();
                 tracing::trace!("Bold delta: {}", delta.json_str());
                 self.deltas.insert(*delta_i, Some(delta));
@@ -139,8 +139,8 @@ impl TestBuilder {
             TestOp::Italic(delta_i, iv, enable) => {
                 let document = &mut self.documents[*delta_i];
                 let attribute = match *enable {
-                    true => RichTextAttribute::Italic(true),
-                    false => RichTextAttribute::Italic(false),
+                    true => TextAttribute::Italic(true),
+                    false => TextAttribute::Italic(false),
                 };
                 let delta = document.format(*iv, attribute).unwrap();
                 tracing::trace!("Italic delta: {}", delta.json_str());
@@ -148,21 +148,21 @@ impl TestBuilder {
             }
             TestOp::Header(delta_i, iv, level) => {
                 let document = &mut self.documents[*delta_i];
-                let attribute = RichTextAttribute::Header(*level);
+                let attribute = TextAttribute::Header(*level);
                 let delta = document.format(*iv, attribute).unwrap();
                 tracing::trace!("Header delta: {}", delta.json_str());
                 self.deltas.insert(*delta_i, Some(delta));
             }
             TestOp::Link(delta_i, iv, link) => {
                 let document = &mut self.documents[*delta_i];
-                let attribute = RichTextAttribute::Link(link.to_owned());
+                let attribute = TextAttribute::Link(link.to_owned());
                 let delta = document.format(*iv, attribute).unwrap();
                 tracing::trace!("Link delta: {}", delta.json_str());
                 self.deltas.insert(*delta_i, Some(delta));
             }
             TestOp::Bullet(delta_i, iv, enable) => {
                 let document = &mut self.documents[*delta_i];
-                let attribute = RichTextAttribute::Bullet(*enable);
+                let attribute = TextAttribute::Bullet(*enable);
                 let delta = document.format(*iv, attribute).unwrap();
                 tracing::debug!("Bullet delta: {}", delta.json_str());
 
@@ -313,18 +313,18 @@ impl Rng {
             };
             match self.0.gen_range(0.0..1.0) {
                 f if f < 0.2 => {
-                    delta.insert(&self.gen_string(i), RichTextAttributes::default());
+                    delta.insert(&self.gen_string(i), TextAttributes::default());
                 }
                 f if f < 0.4 => {
                     delta.delete(i);
                 }
                 _ => {
-                    delta.retain(i, RichTextAttributes::default());
+                    delta.retain(i, TextAttributes::default());
                 }
             }
         }
         if self.0.gen_range(0.0..1.0) < 0.3 {
-            delta.insert(&("1".to_owned() + &self.gen_string(10)), RichTextAttributes::default());
+            delta.insert(&("1".to_owned() + &self.gen_string(10)), TextAttributes::default());
         }
         delta
     }
diff --git a/frontend/rust-lib/flowy-text-block/tests/editor/op_test.rs b/frontend/rust-lib/flowy-text-block/tests/editor/op_test.rs
index 99d3136e55..fd25a2e8f2 100644
--- a/frontend/rust-lib/flowy-text-block/tests/editor/op_test.rs
+++ b/frontend/rust-lib/flowy-text-block/tests/editor/op_test.rs
@@ -5,7 +5,7 @@ use lib_ot::rich_text::RichTextDeltaBuilder;
 use lib_ot::{
     core::Interval,
     core::*,
-    rich_text::{AttributeBuilder, RichTextAttribute, RichTextAttributes, RichTextDelta},
+    rich_text::{AttributeBuilder, RichTextDelta, TextAttribute, TextAttributes},
 };
 
 #[test]
@@ -207,8 +207,8 @@ fn delta_utf16_code_unit_seek() {
 fn delta_utf16_code_unit_seek_with_attributes() {
     let mut delta = RichTextDelta::default();
     let attributes = AttributeBuilder::new()
-        .add_attr(RichTextAttribute::Bold(true))
-        .add_attr(RichTextAttribute::Italic(true))
+        .add_attr(TextAttribute::Bold(true))
+        .add_attr(TextAttribute::Italic(true))
         .build();
 
     delta.add(Operation::insert_with_attributes("1234", attributes.clone()));
@@ -304,13 +304,13 @@ fn lengths() {
     let mut delta = RichTextDelta::default();
     assert_eq!(delta.utf16_base_len, 0);
     assert_eq!(delta.utf16_target_len, 0);
-    delta.retain(5, RichTextAttributes::default());
+    delta.retain(5, TextAttributes::default());
     assert_eq!(delta.utf16_base_len, 5);
     assert_eq!(delta.utf16_target_len, 5);
-    delta.insert("abc", RichTextAttributes::default());
+    delta.insert("abc", TextAttributes::default());
     assert_eq!(delta.utf16_base_len, 5);
     assert_eq!(delta.utf16_target_len, 8);
-    delta.retain(2, RichTextAttributes::default());
+    delta.retain(2, TextAttributes::default());
     assert_eq!(delta.utf16_base_len, 7);
     assert_eq!(delta.utf16_target_len, 10);
     delta.delete(2);
@@ -320,10 +320,10 @@ fn lengths() {
 #[test]
 fn sequence() {
     let mut delta = RichTextDelta::default();
-    delta.retain(5, RichTextAttributes::default());
-    delta.retain(0, RichTextAttributes::default());
-    delta.insert("appflowy", RichTextAttributes::default());
-    delta.insert("", RichTextAttributes::default());
+    delta.retain(5, TextAttributes::default());
+    delta.retain(0, TextAttributes::default());
+    delta.insert("appflowy", TextAttributes::default());
+    delta.insert("", TextAttributes::default());
     delta.delete(3);
     delta.delete(0);
     assert_eq!(delta.ops.len(), 3);
@@ -353,15 +353,15 @@ fn apply_test() {
 #[test]
 fn base_len_test() {
     let mut delta_a = RichTextDelta::default();
-    delta_a.insert("a", RichTextAttributes::default());
-    delta_a.insert("b", RichTextAttributes::default());
-    delta_a.insert("c", RichTextAttributes::default());
+    delta_a.insert("a", TextAttributes::default());
+    delta_a.insert("b", TextAttributes::default());
+    delta_a.insert("c", TextAttributes::default());
 
     let s = "hello world,".to_owned();
     delta_a.delete(s.len());
     let after_a = delta_a.apply(&s).unwrap();
 
-    delta_a.insert("d", RichTextAttributes::default());
+    delta_a.insert("d", TextAttributes::default());
     assert_eq!("abc", &after_a);
 }
 
@@ -392,8 +392,8 @@ fn invert_test() {
 #[test]
 fn empty_ops() {
     let mut delta = RichTextDelta::default();
-    delta.retain(0, RichTextAttributes::default());
-    delta.insert("", RichTextAttributes::default());
+    delta.retain(0, TextAttributes::default());
+    delta.insert("", TextAttributes::default());
     delta.delete(0);
     assert_eq!(delta.ops.len(), 0);
 }
@@ -401,33 +401,33 @@ fn empty_ops() {
 fn eq() {
     let mut delta_a = RichTextDelta::default();
     delta_a.delete(1);
-    delta_a.insert("lo", RichTextAttributes::default());
-    delta_a.retain(2, RichTextAttributes::default());
-    delta_a.retain(3, RichTextAttributes::default());
+    delta_a.insert("lo", TextAttributes::default());
+    delta_a.retain(2, TextAttributes::default());
+    delta_a.retain(3, TextAttributes::default());
     let mut delta_b = RichTextDelta::default();
     delta_b.delete(1);
-    delta_b.insert("l", RichTextAttributes::default());
-    delta_b.insert("o", RichTextAttributes::default());
-    delta_b.retain(5, RichTextAttributes::default());
+    delta_b.insert("l", TextAttributes::default());
+    delta_b.insert("o", TextAttributes::default());
+    delta_b.retain(5, TextAttributes::default());
     assert_eq!(delta_a, delta_b);
     delta_a.delete(1);
-    delta_b.retain(1, RichTextAttributes::default());
+    delta_b.retain(1, TextAttributes::default());
     assert_ne!(delta_a, delta_b);
 }
 #[test]
 fn ops_merging() {
     let mut delta = RichTextDelta::default();
     assert_eq!(delta.ops.len(), 0);
-    delta.retain(2, RichTextAttributes::default());
+    delta.retain(2, TextAttributes::default());
     assert_eq!(delta.ops.len(), 1);
     assert_eq!(delta.ops.last(), Some(&Operation::retain(2)));
-    delta.retain(3, RichTextAttributes::default());
+    delta.retain(3, TextAttributes::default());
     assert_eq!(delta.ops.len(), 1);
     assert_eq!(delta.ops.last(), Some(&Operation::retain(5)));
-    delta.insert("abc", RichTextAttributes::default());
+    delta.insert("abc", TextAttributes::default());
     assert_eq!(delta.ops.len(), 2);
     assert_eq!(delta.ops.last(), Some(&Operation::insert("abc")));
-    delta.insert("xyz", RichTextAttributes::default());
+    delta.insert("xyz", TextAttributes::default());
     assert_eq!(delta.ops.len(), 2);
     assert_eq!(delta.ops.last(), Some(&Operation::insert("abcxyz")));
     delta.delete(1);
@@ -442,11 +442,11 @@ fn ops_merging() {
 fn is_noop() {
     let mut delta = RichTextDelta::default();
     assert!(delta.is_noop());
-    delta.retain(5, RichTextAttributes::default());
+    delta.retain(5, TextAttributes::default());
     assert!(delta.is_noop());
-    delta.retain(3, RichTextAttributes::default());
+    delta.retain(3, TextAttributes::default());
     assert!(delta.is_noop());
-    delta.insert("lorem", RichTextAttributes::default());
+    delta.insert("lorem", TextAttributes::default());
     assert!(!delta.is_noop());
 }
 #[test]
@@ -492,14 +492,14 @@ fn transform_with_two_delta() {
     let mut a_s = String::new();
     a.insert(
         "123",
-        AttributeBuilder::new().add_attr(RichTextAttribute::Bold(true)).build(),
+        AttributeBuilder::new().add_attr(TextAttribute::Bold(true)).build(),
     );
     a_s = a.apply(&a_s).unwrap();
     assert_eq!(&a_s, "123");
 
     let mut b = RichTextDelta::default();
     let mut b_s = String::new();
-    b.insert("456", RichTextAttributes::default());
+    b.insert("456", TextAttributes::default());
     b_s = b.apply(&b_s).unwrap();
     assert_eq!(&b_s, "456");
 
diff --git a/frontend/rust-lib/flowy-text-block/tests/editor/serde_test.rs b/frontend/rust-lib/flowy-text-block/tests/editor/serde_test.rs
index ac4a77412c..2d2e6bc143 100644
--- a/frontend/rust-lib/flowy-text-block/tests/editor/serde_test.rs
+++ b/frontend/rust-lib/flowy-text-block/tests/editor/serde_test.rs
@@ -2,14 +2,14 @@ use flowy_sync::client_document::{ClientDocument, PlainDoc};
 use lib_ot::rich_text::RichTextOperation;
 use lib_ot::{
     core::*,
-    rich_text::{AttributeBuilder, RichTextAttribute, RichTextAttributeValue, RichTextDelta},
+    rich_text::{AttributeBuilder, RichTextDelta, TextAttribute, TextAttributeValue},
 };
 
 #[test]
 fn operation_insert_serialize_test() {
     let attributes = AttributeBuilder::new()
-        .add_attr(RichTextAttribute::Bold(true))
-        .add_attr(RichTextAttribute::Italic(true))
+        .add_attr(TextAttribute::Bold(true))
+        .add_attr(TextAttribute::Italic(true))
         .build();
     let operation = Operation::insert_with_attributes("123", attributes);
     let json = serde_json::to_string(&operation).unwrap();
@@ -39,8 +39,8 @@ fn operation_delete_serialize_test() {
 #[test]
 fn attributes_serialize_test() {
     let attributes = AttributeBuilder::new()
-        .add_attr(RichTextAttribute::Bold(true))
-        .add_attr(RichTextAttribute::Italic(true))
+        .add_attr(TextAttribute::Bold(true))
+        .add_attr(TextAttribute::Italic(true))
         .build();
     let retain = Operation::insert_with_attributes("123", attributes);
 
@@ -53,8 +53,8 @@ fn delta_serialize_multi_attribute_test() {
     let mut delta = Delta::default();
 
     let attributes = AttributeBuilder::new()
-        .add_attr(RichTextAttribute::Bold(true))
-        .add_attr(RichTextAttribute::Italic(true))
+        .add_attr(TextAttribute::Bold(true))
+        .add_attr(TextAttribute::Italic(true))
         .build();
     let retain = Operation::insert_with_attributes("123", attributes);
 
@@ -88,8 +88,8 @@ fn delta_deserialize_null_test() {
      ]"#;
     let delta1 = RichTextDelta::from_json(json).unwrap();
 
-    let mut attribute = RichTextAttribute::Bold(true);
-    attribute.value = RichTextAttributeValue(None);
+    let mut attribute = TextAttribute::Bold(true);
+    attribute.value = TextAttributeValue(None);
     let delta2 = DeltaBuilder::new().retain_with_attributes(7, attribute.into()).build();
 
     assert_eq!(delta2.json_str(), r#"[{"retain":7,"attributes":{"bold":""}}]"#);
@@ -98,8 +98,8 @@ fn delta_deserialize_null_test() {
 
 #[test]
 fn delta_serde_null_test() {
-    let mut attribute = RichTextAttribute::Bold(true);
-    attribute.value = RichTextAttributeValue(None);
+    let mut attribute = TextAttribute::Bold(true);
+    attribute.value = TextAttributeValue(None);
     assert_eq!(attribute.to_json(), r#"{"bold":""}"#);
 }
 
diff --git a/shared-lib/flowy-sync/src/client_document/document_pad.rs b/shared-lib/flowy-sync/src/client_document/document_pad.rs
index 9a1037d0c8..28915e259d 100644
--- a/shared-lib/flowy-sync/src/client_document/document_pad.rs
+++ b/shared-lib/flowy-sync/src/client_document/document_pad.rs
@@ -9,7 +9,7 @@ use crate::{
 use bytes::Bytes;
 use lib_ot::{
     core::*,
-    rich_text::{RichTextAttribute, RichTextDelta},
+    rich_text::{RichTextDelta, TextAttribute},
 };
 use tokio::sync::mpsc;
 
@@ -141,11 +141,7 @@ impl ClientDocument {
         Ok(delete)
     }
 
-    pub fn format(
-        &mut self,
-        interval: Interval,
-        attribute: RichTextAttribute,
-    ) -> Result<RichTextDelta, CollaborateError> {
+    pub fn format(&mut self, interval: Interval, attribute: TextAttribute) -> Result<RichTextDelta, CollaborateError> {
         let _ = validate_interval(&self.delta, &interval)?;
         tracing::trace!("format {} with {}", interval, attribute);
         let format_delta = self.view.format(&self.delta, attribute, interval).unwrap();
diff --git a/shared-lib/flowy-sync/src/client_document/extensions/format/resolve_block_format.rs b/shared-lib/flowy-sync/src/client_document/extensions/format/resolve_block_format.rs
index 4a4c00a19d..3437080f37 100644
--- a/shared-lib/flowy-sync/src/client_document/extensions/format/resolve_block_format.rs
+++ b/shared-lib/flowy-sync/src/client_document/extensions/format/resolve_block_format.rs
@@ -1,6 +1,6 @@
 use lib_ot::{
     core::{DeltaBuilder, DeltaIterator, Interval},
-    rich_text::{plain_attributes, AttributeScope, RichTextAttribute, RichTextDelta},
+    rich_text::{plain_attributes, AttributeScope, RichTextDelta, TextAttribute},
 };
 
 use crate::{
@@ -14,7 +14,7 @@ impl FormatExt for ResolveBlockFormat {
         "ResolveBlockFormat"
     }
 
-    fn apply(&self, delta: &RichTextDelta, interval: Interval, attribute: &RichTextAttribute) -> Option<RichTextDelta> {
+    fn apply(&self, delta: &RichTextDelta, interval: Interval, attribute: &TextAttribute) -> Option<RichTextDelta> {
         if attribute.scope != AttributeScope::Block {
             return None;
         }
diff --git a/shared-lib/flowy-sync/src/client_document/extensions/format/resolve_inline_format.rs b/shared-lib/flowy-sync/src/client_document/extensions/format/resolve_inline_format.rs
index 567d06d6f2..8b654b0787 100644
--- a/shared-lib/flowy-sync/src/client_document/extensions/format/resolve_inline_format.rs
+++ b/shared-lib/flowy-sync/src/client_document/extensions/format/resolve_inline_format.rs
@@ -1,6 +1,6 @@
 use lib_ot::{
     core::{DeltaBuilder, DeltaIterator, Interval},
-    rich_text::{AttributeScope, RichTextAttribute, RichTextDelta},
+    rich_text::{AttributeScope, RichTextDelta, TextAttribute},
 };
 
 use crate::{
@@ -14,7 +14,7 @@ impl FormatExt for ResolveInlineFormat {
         "ResolveInlineFormat"
     }
 
-    fn apply(&self, delta: &RichTextDelta, interval: Interval, attribute: &RichTextAttribute) -> Option<RichTextDelta> {
+    fn apply(&self, delta: &RichTextDelta, interval: Interval, attribute: &TextAttribute) -> Option<RichTextDelta> {
         if attribute.scope != AttributeScope::Inline {
             return None;
         }
diff --git a/shared-lib/flowy-sync/src/client_document/extensions/helper.rs b/shared-lib/flowy-sync/src/client_document/extensions/helper.rs
index a4745bf7ca..6c6a0e2d25 100644
--- a/shared-lib/flowy-sync/src/client_document/extensions/helper.rs
+++ b/shared-lib/flowy-sync/src/client_document/extensions/helper.rs
@@ -1,11 +1,7 @@
 use crate::util::find_newline;
-use lib_ot::rich_text::{plain_attributes, AttributeScope, RichTextAttribute, RichTextDelta, RichTextOperation};
+use lib_ot::rich_text::{plain_attributes, AttributeScope, RichTextDelta, RichTextOperation, TextAttribute};
 
-pub(crate) fn line_break(
-    op: &RichTextOperation,
-    attribute: &RichTextAttribute,
-    scope: AttributeScope,
-) -> RichTextDelta {
+pub(crate) fn line_break(op: &RichTextOperation, attribute: &TextAttribute, scope: AttributeScope) -> RichTextDelta {
     let mut new_delta = RichTextDelta::new();
     let mut start = 0;
     let end = op.len();
diff --git a/shared-lib/flowy-sync/src/client_document/extensions/insert/auto_exit_block.rs b/shared-lib/flowy-sync/src/client_document/extensions/insert/auto_exit_block.rs
index 253833d255..d7a0b7dea5 100644
--- a/shared-lib/flowy-sync/src/client_document/extensions/insert/auto_exit_block.rs
+++ b/shared-lib/flowy-sync/src/client_document/extensions/insert/auto_exit_block.rs
@@ -1,6 +1,6 @@
 use crate::{client_document::InsertExt, util::is_newline};
 use lib_ot::core::{is_empty_line_at_index, DeltaBuilder, DeltaIterator};
-use lib_ot::rich_text::{attributes_except_header, RichTextAttributeKey, RichTextDelta};
+use lib_ot::rich_text::{attributes_except_header, RichTextDelta, TextAttributeKey};
 
 pub struct AutoExitBlock {}
 
@@ -42,7 +42,7 @@ impl InsertExt for AutoExitBlock {
             }
         }
 
-        attributes.mark_all_as_removed_except(Some(RichTextAttributeKey::Header));
+        attributes.mark_all_as_removed_except(Some(TextAttributeKey::Header));
 
         Some(
             DeltaBuilder::new()
diff --git a/shared-lib/flowy-sync/src/client_document/extensions/insert/auto_format.rs b/shared-lib/flowy-sync/src/client_document/extensions/insert/auto_format.rs
index 4c7cd642c2..07e9d3d116 100644
--- a/shared-lib/flowy-sync/src/client_document/extensions/insert/auto_format.rs
+++ b/shared-lib/flowy-sync/src/client_document/extensions/insert/auto_format.rs
@@ -1,7 +1,7 @@
 use crate::{client_document::InsertExt, util::is_whitespace};
 use lib_ot::{
     core::{count_utf16_code_units, DeltaBuilder, DeltaIterator},
-    rich_text::{plain_attributes, RichTextAttribute, RichTextAttributes, RichTextDelta},
+    rich_text::{plain_attributes, RichTextDelta, TextAttribute, TextAttributes},
 };
 use std::cmp::min;
 use url::Url;
@@ -60,9 +60,9 @@ pub enum AutoFormatter {
 }
 
 impl AutoFormatter {
-    pub fn to_attributes(&self) -> RichTextAttributes {
+    pub fn to_attributes(&self) -> TextAttributes {
         match self {
-            AutoFormatter::Url(url) => RichTextAttribute::Link(url.as_str()).into(),
+            AutoFormatter::Url(url) => TextAttribute::Link(url.as_str()).into(),
         }
     }
 
diff --git a/shared-lib/flowy-sync/src/client_document/extensions/insert/default_insert.rs b/shared-lib/flowy-sync/src/client_document/extensions/insert/default_insert.rs
index c165985493..3f29404136 100644
--- a/shared-lib/flowy-sync/src/client_document/extensions/insert/default_insert.rs
+++ b/shared-lib/flowy-sync/src/client_document/extensions/insert/default_insert.rs
@@ -1,7 +1,7 @@
 use crate::client_document::InsertExt;
 use lib_ot::{
     core::{Attributes, DeltaBuilder, DeltaIterator, NEW_LINE},
-    rich_text::{RichTextAttributeKey, RichTextAttributes, RichTextDelta},
+    rich_text::{RichTextDelta, TextAttributeKey, TextAttributes},
 };
 
 pub struct DefaultInsertAttribute {}
@@ -12,7 +12,7 @@ impl InsertExt for DefaultInsertAttribute {
 
     fn apply(&self, delta: &RichTextDelta, replace_len: usize, text: &str, index: usize) -> Option<RichTextDelta> {
         let iter = DeltaIterator::new(delta);
-        let mut attributes = RichTextAttributes::new();
+        let mut attributes = TextAttributes::new();
 
         // Enable each line split by "\n" remains the block attributes. for example:
         // insert "\n" to "123456" at index 3
@@ -23,7 +23,7 @@ impl InsertExt for DefaultInsertAttribute {
             match iter.last() {
                 None => {}
                 Some(op) => {
-                    if op.get_attributes().contains_key(&RichTextAttributeKey::Header) {
+                    if op.get_attributes().contains_key(&TextAttributeKey::Header) {
                         attributes.extend_other(op.get_attributes());
                     }
                 }
diff --git a/shared-lib/flowy-sync/src/client_document/extensions/insert/preserve_block_format.rs b/shared-lib/flowy-sync/src/client_document/extensions/insert/preserve_block_format.rs
index 03c9723d7b..21c781524f 100644
--- a/shared-lib/flowy-sync/src/client_document/extensions/insert/preserve_block_format.rs
+++ b/shared-lib/flowy-sync/src/client_document/extensions/insert/preserve_block_format.rs
@@ -2,8 +2,7 @@ use crate::{client_document::InsertExt, util::is_newline};
 use lib_ot::{
     core::{DeltaBuilder, DeltaIterator, NEW_LINE},
     rich_text::{
-        attributes_except_header, plain_attributes, RichTextAttribute, RichTextAttributeKey, RichTextAttributes,
-        RichTextDelta,
+        attributes_except_header, plain_attributes, RichTextDelta, TextAttribute, TextAttributeKey, TextAttributes,
     },
 };
 
@@ -28,9 +27,9 @@ impl InsertExt for PreserveBlockFormatOnInsert {
                     return None;
                 }
 
-                let mut reset_attribute = RichTextAttributes::new();
-                if newline_attributes.contains_key(&RichTextAttributeKey::Header) {
-                    reset_attribute.add(RichTextAttribute::Header(1));
+                let mut reset_attribute = TextAttributes::new();
+                if newline_attributes.contains_key(&TextAttributeKey::Header) {
+                    reset_attribute.add(TextAttribute::Header(1));
                 }
 
                 let lines: Vec<_> = text.split(NEW_LINE).collect();
diff --git a/shared-lib/flowy-sync/src/client_document/extensions/insert/preserve_inline_format.rs b/shared-lib/flowy-sync/src/client_document/extensions/insert/preserve_inline_format.rs
index b0de6451aa..be65a1432d 100644
--- a/shared-lib/flowy-sync/src/client_document/extensions/insert/preserve_inline_format.rs
+++ b/shared-lib/flowy-sync/src/client_document/extensions/insert/preserve_inline_format.rs
@@ -4,7 +4,7 @@ use crate::{
 };
 use lib_ot::{
     core::{DeltaBuilder, DeltaIterator, OpNewline, NEW_LINE},
-    rich_text::{plain_attributes, RichTextAttributeKey, RichTextDelta},
+    rich_text::{plain_attributes, RichTextDelta, TextAttributeKey},
 };
 
 pub struct PreserveInlineFormat {}
@@ -25,7 +25,7 @@ impl InsertExt for PreserveInlineFormat {
         }
 
         let mut attributes = prev.get_attributes();
-        if attributes.is_empty() || !attributes.contains_key(&RichTextAttributeKey::Link) {
+        if attributes.is_empty() || !attributes.contains_key(&TextAttributeKey::Link) {
             return Some(
                 DeltaBuilder::new()
                     .retain(index + replace_len)
diff --git a/shared-lib/flowy-sync/src/client_document/extensions/insert/reset_format_on_new_line.rs b/shared-lib/flowy-sync/src/client_document/extensions/insert/reset_format_on_new_line.rs
index 8671049ee7..3324df3398 100644
--- a/shared-lib/flowy-sync/src/client_document/extensions/insert/reset_format_on_new_line.rs
+++ b/shared-lib/flowy-sync/src/client_document/extensions/insert/reset_format_on_new_line.rs
@@ -1,7 +1,7 @@
 use crate::{client_document::InsertExt, util::is_newline};
 use lib_ot::{
     core::{DeltaBuilder, DeltaIterator, Utf16CodeUnitMetric, NEW_LINE},
-    rich_text::{RichTextAttributeKey, RichTextAttributes, RichTextDelta},
+    rich_text::{RichTextDelta, TextAttributeKey, TextAttributes},
 };
 
 pub struct ResetLineFormatOnNewLine {}
@@ -22,9 +22,9 @@ impl InsertExt for ResetLineFormatOnNewLine {
             return None;
         }
 
-        let mut reset_attribute = RichTextAttributes::new();
-        if next_op.get_attributes().contains_key(&RichTextAttributeKey::Header) {
-            reset_attribute.delete(&RichTextAttributeKey::Header);
+        let mut reset_attribute = TextAttributes::new();
+        if next_op.get_attributes().contains_key(&TextAttributeKey::Header) {
+            reset_attribute.delete(&TextAttributeKey::Header);
         }
 
         let len = index + replace_len;
diff --git a/shared-lib/flowy-sync/src/client_document/extensions/mod.rs b/shared-lib/flowy-sync/src/client_document/extensions/mod.rs
index d24e78fab1..ffbb6c0a9e 100644
--- a/shared-lib/flowy-sync/src/client_document/extensions/mod.rs
+++ b/shared-lib/flowy-sync/src/client_document/extensions/mod.rs
@@ -3,7 +3,7 @@ pub use format::*;
 pub use insert::*;
 use lib_ot::{
     core::Interval,
-    rich_text::{RichTextAttribute, RichTextDelta},
+    rich_text::{RichTextDelta, TextAttribute},
 };
 
 mod delete;
@@ -22,7 +22,7 @@ pub trait InsertExt {
 
 pub trait FormatExt {
     fn ext_name(&self) -> &str;
-    fn apply(&self, delta: &RichTextDelta, interval: Interval, attribute: &RichTextAttribute) -> Option<RichTextDelta>;
+    fn apply(&self, delta: &RichTextDelta, interval: Interval, attribute: &TextAttribute) -> Option<RichTextDelta>;
 }
 
 pub trait DeleteExt {
diff --git a/shared-lib/flowy-sync/src/client_document/view.rs b/shared-lib/flowy-sync/src/client_document/view.rs
index 3aefe8debd..90b33b0312 100644
--- a/shared-lib/flowy-sync/src/client_document/view.rs
+++ b/shared-lib/flowy-sync/src/client_document/view.rs
@@ -2,7 +2,7 @@ use crate::client_document::*;
 use lib_ot::{
     core::{trim, Interval},
     errors::{ErrorBuilder, OTError, OTErrorCode},
-    rich_text::{RichTextAttribute, RichTextDelta},
+    rich_text::{RichTextDelta, TextAttribute},
 };
 
 pub const RECORD_THRESHOLD: usize = 400; // in milliseconds
@@ -64,7 +64,7 @@ impl ViewExtensions {
     pub(crate) fn format(
         &self,
         delta: &RichTextDelta,
-        attribute: RichTextAttribute,
+        attribute: TextAttribute,
         interval: Interval,
     ) -> Result<RichTextDelta, OTError> {
         let mut new_delta = None;
diff --git a/shared-lib/flowy-sync/src/server_document/document_manager.rs b/shared-lib/flowy-sync/src/server_document/document_manager.rs
index 59d3dd3c97..a7188799f9 100644
--- a/shared-lib/flowy-sync/src/server_document/document_manager.rs
+++ b/shared-lib/flowy-sync/src/server_document/document_manager.rs
@@ -11,7 +11,7 @@ use async_stream::stream;
 use dashmap::DashMap;
 use futures::stream::StreamExt;
 use lib_infra::future::BoxResultFuture;
-use lib_ot::rich_text::{RichTextAttributes, RichTextDelta};
+use lib_ot::rich_text::{RichTextDelta, TextAttributes};
 use std::{collections::HashMap, fmt::Debug, sync::Arc};
 use tokio::{
     sync::{mpsc, oneshot, RwLock},
@@ -198,7 +198,7 @@ impl std::ops::Drop for ServerDocumentManager {
     }
 }
 
-type DocumentRevisionSynchronizer = RevisionSynchronizer<RichTextAttributes>;
+type DocumentRevisionSynchronizer = RevisionSynchronizer<TextAttributes>;
 
 struct OpenDocumentHandler {
     doc_id: String,
diff --git a/shared-lib/flowy-sync/src/server_document/document_pad.rs b/shared-lib/flowy-sync/src/server_document/document_pad.rs
index 28623a0169..f444816cd6 100644
--- a/shared-lib/flowy-sync/src/server_document/document_pad.rs
+++ b/shared-lib/flowy-sync/src/server_document/document_pad.rs
@@ -1,7 +1,7 @@
 use crate::{client_document::InitialDocumentText, errors::CollaborateError, synchronizer::RevisionSyncObject};
 use lib_ot::{
     core::*,
-    rich_text::{RichTextAttributes, RichTextDelta},
+    rich_text::{RichTextDelta, TextAttributes},
 };
 
 pub struct ServerDocument {
@@ -21,7 +21,7 @@ impl ServerDocument {
     }
 }
 
-impl RevisionSyncObject<RichTextAttributes> for ServerDocument {
+impl RevisionSyncObject<TextAttributes> for ServerDocument {
     fn id(&self) -> &str {
         &self.doc_id
     }
@@ -42,7 +42,7 @@ impl RevisionSyncObject<RichTextAttributes> for ServerDocument {
         self.delta.json_str()
     }
 
-    fn set_delta(&mut self, new_delta: Delta<RichTextAttributes>) {
+    fn set_delta(&mut self, new_delta: Delta<TextAttributes>) {
         self.delta = new_delta;
     }
 }
diff --git a/shared-lib/lib-ot/src/codec/markdown/markdown_encoder.rs b/shared-lib/lib-ot/src/codec/markdown/markdown_encoder.rs
index f338a029a4..82332792e5 100644
--- a/shared-lib/lib-ot/src/codec/markdown/markdown_encoder.rs
+++ b/shared-lib/lib-ot/src/codec/markdown/markdown_encoder.rs
@@ -1,5 +1,5 @@
 use crate::core::{Delta, DeltaIterator};
-use crate::rich_text::{is_block, RichTextAttributeKey, RichTextAttributeValue, RichTextAttributes};
+use crate::rich_text::{is_block, TextAttributeKey, TextAttributeValue, TextAttributes};
 use std::collections::HashMap;
 
 const LINEFEEDASCIICODE: i32 = 0x0A;
@@ -98,14 +98,14 @@ mod tests {
 }
 
 struct Attribute {
-    key: RichTextAttributeKey,
-    value: RichTextAttributeValue,
+    key: TextAttributeKey,
+    value: TextAttributeValue,
 }
 
-pub fn markdown_encoder(delta: &Delta<RichTextAttributes>) -> String {
+pub fn markdown_encoder(delta: &Delta<TextAttributes>) -> String {
     let mut markdown_buffer = String::new();
     let mut line_buffer = String::new();
-    let mut current_inline_style = RichTextAttributes::default();
+    let mut current_inline_style = TextAttributes::default();
     let mut current_block_lines: Vec<String> = Vec::new();
     let mut iterator = DeltaIterator::new(delta);
     let mut current_block_style: Option<Attribute> = None;
@@ -138,17 +138,17 @@ pub fn markdown_encoder(delta: &Delta<RichTextAttributes>) -> String {
 }
 
 fn handle_inline(
-    current_inline_style: &mut RichTextAttributes,
+    current_inline_style: &mut TextAttributes,
     buffer: &mut String,
     mut text: String,
-    attributes: RichTextAttributes,
+    attributes: TextAttributes,
 ) {
-    let mut marked_for_removal: HashMap<RichTextAttributeKey, RichTextAttributeValue> = HashMap::new();
+    let mut marked_for_removal: HashMap<TextAttributeKey, TextAttributeValue> = HashMap::new();
 
     for key in current_inline_style
         .clone()
         .keys()
-        .collect::<Vec<&RichTextAttributeKey>>()
+        .collect::<Vec<&TextAttributeKey>>()
         .into_iter()
         .rev()
     {
@@ -205,46 +205,46 @@ fn trim_right(buffer: &mut String) -> String {
     " ".repeat(text.len() - result.len())
 }
 
-fn write_attribute(buffer: &mut String, key: &RichTextAttributeKey, value: &RichTextAttributeValue, close: bool) {
+fn write_attribute(buffer: &mut String, key: &TextAttributeKey, value: &TextAttributeValue, close: bool) {
     match key {
-        RichTextAttributeKey::Bold => buffer.push_str("**"),
-        RichTextAttributeKey::Italic => buffer.push_str("_"),
-        RichTextAttributeKey::Underline => {
+        TextAttributeKey::Bold => buffer.push_str("**"),
+        TextAttributeKey::Italic => buffer.push_str("_"),
+        TextAttributeKey::Underline => {
             if close {
                 buffer.push_str("</u>")
             } else {
                 buffer.push_str("<u>")
             }
         }
-        RichTextAttributeKey::StrikeThrough => {
+        TextAttributeKey::StrikeThrough => {
             if close {
                 buffer.push_str("~~")
             } else {
                 buffer.push_str("~~")
             }
         }
-        RichTextAttributeKey::Link => {
+        TextAttributeKey::Link => {
             if close {
                 buffer.push_str(format!("]({})", value.0.as_ref().unwrap()).as_str())
             } else {
                 buffer.push_str("[")
             }
         }
-        RichTextAttributeKey::Background => {
+        TextAttributeKey::Background => {
             if close {
                 buffer.push_str("</mark>")
             } else {
                 buffer.push_str("<mark>")
             }
         }
-        RichTextAttributeKey::CodeBlock => {
+        TextAttributeKey::CodeBlock => {
             if close {
                 buffer.push_str("\n```")
             } else {
                 buffer.push_str("```\n")
             }
         }
-        RichTextAttributeKey::InlineCode => {
+        TextAttributeKey::InlineCode => {
             if close {
                 buffer.push_str("`")
             } else {
@@ -259,10 +259,10 @@ fn handle_line(
     buffer: &mut String,
     markdown_buffer: &mut String,
     data: String,
-    attributes: RichTextAttributes,
+    attributes: TextAttributes,
     current_block_style: &mut Option<Attribute>,
     current_block_lines: &mut Vec<String>,
-    current_inline_style: &mut RichTextAttributes,
+    current_inline_style: &mut TextAttributes,
 ) {
     let mut span = String::new();
     for c in data.chars() {
@@ -274,7 +274,7 @@ fn handle_line(
                 current_inline_style,
                 buffer,
                 String::from(""),
-                RichTextAttributes::default(),
+                TextAttributes::default(),
             );
 
             let line_block_key = attributes.keys().find(|key| {
@@ -339,7 +339,7 @@ fn handle_block(
             markdown_buffer.push_str(&current_block_lines.join("\n"));
             markdown_buffer.push('\n');
         }
-        Some(block_style) if block_style.key == RichTextAttributeKey::CodeBlock => {
+        Some(block_style) if block_style.key == TextAttributeKey::CodeBlock => {
             write_attribute(markdown_buffer, &block_style.key, &block_style.value, false);
             markdown_buffer.push_str(&current_block_lines.join("\n"));
             write_attribute(markdown_buffer, &block_style.key, &block_style.value, true);
@@ -360,9 +360,9 @@ fn write_block_tag(buffer: &mut String, block: &Attribute, close: bool) {
         return;
     }
 
-    if block.key == RichTextAttributeKey::BlockQuote {
+    if block.key == TextAttributeKey::BlockQuote {
         buffer.push_str("> ");
-    } else if block.key == RichTextAttributeKey::List {
+    } else if block.key == TextAttributeKey::List {
         if block.value.0.as_ref().unwrap().eq("bullet") {
             buffer.push_str("* ");
         } else if block.value.0.as_ref().unwrap().eq("checked") {
@@ -374,14 +374,14 @@ fn write_block_tag(buffer: &mut String, block: &Attribute, close: bool) {
         } else {
             buffer.push_str("* ");
         }
-    } else if block.key == RichTextAttributeKey::Header {
+    } else if block.key == TextAttributeKey::Header {
         if block.value.0.as_ref().unwrap().eq("1") {
             buffer.push_str("# ");
         } else if block.value.0.as_ref().unwrap().eq("2") {
             buffer.push_str("## ");
         } else if block.value.0.as_ref().unwrap().eq("3") {
             buffer.push_str("### ");
-        } else if block.key == RichTextAttributeKey::List {
+        } else if block.key == TextAttributeKey::List {
         }
     }
 }
diff --git a/shared-lib/lib-ot/src/core/delta/builder.rs b/shared-lib/lib-ot/src/core/delta/builder.rs
index 482b1ca8a9..d8bede927f 100644
--- a/shared-lib/lib-ot/src/core/delta/builder.rs
+++ b/shared-lib/lib-ot/src/core/delta/builder.rs
@@ -50,9 +50,9 @@ where
     /// # Examples
     ///
     /// ```
-    /// use lib_ot::rich_text::{RichTextAttribute, RichTextDelta, RichTextDeltaBuilder};
+    /// use lib_ot::rich_text::{TextAttribute, RichTextDelta, RichTextDeltaBuilder};
     ///
-    /// let mut attribute = RichTextAttribute::Bold(true);
+    /// let mut attribute = TextAttribute::Bold(true);
     /// let delta = RichTextDeltaBuilder::new().retain_with_attributes(7, attribute.into()).build();
     ///
     /// assert_eq!(delta.json_str(), r#"[{"retain":7,"attributes":{"bold":true}}]"#);
@@ -109,7 +109,7 @@ where
     ///
     /// ```
     /// use lib_ot::core::{OperationTransform, TextDeltaBuilder};
-    /// use lib_ot::rich_text::{RichTextAttribute, RichTextDeltaBuilder};
+    /// use lib_ot::rich_text::{TextAttribute, RichTextDeltaBuilder};
     /// let delta = TextDeltaBuilder::new()
     ///         .retain(3)
     ///         .trim()
@@ -117,7 +117,7 @@ where
     /// assert_eq!(delta.ops.len(), 0);
     ///
     /// let delta = RichTextDeltaBuilder::new()
-    ///         .retain_with_attributes(3, RichTextAttribute::Bold(true).into())
+    ///         .retain_with_attributes(3, TextAttribute::Bold(true).into())
     ///         .trim()
     ///         .build();
     /// assert_eq!(delta.ops.len(), 1);
diff --git a/shared-lib/lib-ot/src/core/delta/iterator.rs b/shared-lib/lib-ot/src/core/delta/iterator.rs
index 7997d23bae..53fb4f879b 100644
--- a/shared-lib/lib-ot/src/core/delta/iterator.rs
+++ b/shared-lib/lib-ot/src/core/delta/iterator.rs
@@ -2,7 +2,7 @@ use super::cursor::*;
 use crate::core::delta::{Delta, NEW_LINE};
 use crate::core::interval::Interval;
 use crate::core::operation::{Attributes, Operation};
-use crate::rich_text::RichTextAttributes;
+use crate::rich_text::TextAttributes;
 use std::ops::{Deref, DerefMut};
 
 pub(crate) const MAX_IV_LEN: usize = i32::MAX as usize;
@@ -132,7 +132,7 @@ where
     }
 }
 
-pub fn is_empty_line_at_index(delta: &Delta<RichTextAttributes>, index: usize) -> bool {
+pub fn is_empty_line_at_index(delta: &Delta<TextAttributes>, index: usize) -> bool {
     let mut iter = DeltaIterator::new(delta);
     let (prev, next) = (iter.next_op_with_len(index), iter.next_op());
     if prev.is_none() {
diff --git a/shared-lib/lib-ot/src/core/document/attributes.rs b/shared-lib/lib-ot/src/core/document/attributes.rs
index ca5878fb4b..5ad89fbee9 100644
--- a/shared-lib/lib-ot/src/core/document/attributes.rs
+++ b/shared-lib/lib-ot/src/core/document/attributes.rs
@@ -1,10 +1,12 @@
+use crate::core::OperationTransform;
+use crate::errors::OTError;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 
-pub type AttributeMap = HashMap<String, Option<String>>;
+pub type AttributeMap = HashMap<AttributeKey, AttributeValue>;
 
 #[derive(Clone, Serialize, Deserialize, Eq, PartialEq, Debug)]
-pub struct NodeAttributes(pub AttributeMap);
+pub struct NodeAttributes(AttributeMap);
 
 impl Default for NodeAttributes {
     fn default() -> Self {
@@ -31,19 +33,120 @@ impl NodeAttributes {
         NodeAttributes(HashMap::new())
     }
 
+    pub fn from_value(attribute_map: AttributeMap) -> Self {
+        Self(attribute_map)
+    }
+
     pub fn to_inner(&self) -> AttributeMap {
         self.0.clone()
     }
 
-    pub fn compose(a: &NodeAttributes, b: &NodeAttributes) -> NodeAttributes {
-        let mut new_map: AttributeMap = b.0.clone();
+    pub fn insert<K: ToString, V: Into<AttributeValue>>(&mut self, key: K, value: V) {
+        self.0.insert(key.to_string(), value.into());
+    }
 
-        for (key, value) in &a.0 {
-            if b.0.contains_key(key.as_str()) {
-                new_map.insert(key.into(), value.clone());
-            }
-        }
-
-        NodeAttributes(new_map)
+    pub fn delete(&mut self, key: &AttributeKey) {
+        self.insert(key.clone(), AttributeValue(None));
+    }
+}
+
+impl OperationTransform for NodeAttributes {
+    fn compose(&self, other: &Self) -> Result<Self, OTError>
+    where
+        Self: Sized,
+    {
+        let mut attributes = self.clone();
+        attributes.0.extend(other.clone().0);
+        Ok(attributes)
+    }
+
+    fn transform(&self, other: &Self) -> Result<(Self, Self), OTError>
+    where
+        Self: Sized,
+    {
+        let a = self.iter().fold(NodeAttributes::new(), |mut new_attributes, (k, v)| {
+            if !other.contains_key(k) {
+                new_attributes.insert(k.clone(), v.clone());
+            }
+            new_attributes
+        });
+
+        let b = other.iter().fold(NodeAttributes::new(), |mut new_attributes, (k, v)| {
+            if !self.contains_key(k) {
+                new_attributes.insert(k.clone(), v.clone());
+            }
+            new_attributes
+        });
+
+        Ok((a, b))
+    }
+
+    fn invert(&self, other: &Self) -> Self {
+        let base_inverted = other.iter().fold(NodeAttributes::new(), |mut attributes, (k, v)| {
+            if other.get(k) != self.get(k) && self.contains_key(k) {
+                attributes.insert(k.clone(), v.clone());
+            }
+            attributes
+        });
+
+        self.iter().fold(base_inverted, |mut attributes, (k, _)| {
+            if other.get(k) != self.get(k) && !other.contains_key(k) {
+                attributes.delete(k);
+            }
+            attributes
+        })
+    }
+}
+
+pub type AttributeKey = String;
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub struct AttributeValue(pub Option<String>);
+
+impl std::convert::From<&usize> for AttributeValue {
+    fn from(val: &usize) -> Self {
+        AttributeValue::from(*val)
+    }
+}
+
+impl std::convert::From<usize> for AttributeValue {
+    fn from(val: usize) -> Self {
+        if val > 0_usize {
+            AttributeValue(Some(format!("{}", val)))
+        } else {
+            AttributeValue(None)
+        }
+    }
+}
+
+impl std::convert::From<&str> for AttributeValue {
+    fn from(val: &str) -> Self {
+        val.to_owned().into()
+    }
+}
+
+impl std::convert::From<String> for AttributeValue {
+    fn from(val: String) -> Self {
+        if val.is_empty() {
+            AttributeValue(None)
+        } else {
+            AttributeValue(Some(val))
+        }
+    }
+}
+
+impl std::convert::From<&bool> for AttributeValue {
+    fn from(val: &bool) -> Self {
+        AttributeValue::from(*val)
+    }
+}
+
+impl std::convert::From<bool> for AttributeValue {
+    fn from(val: bool) -> Self {
+        let val = match val {
+            true => Some("true".to_owned()),
+            false => None,
+        };
+        AttributeValue(val)
     }
 }
diff --git a/shared-lib/lib-ot/src/core/document/mod.rs b/shared-lib/lib-ot/src/core/document/mod.rs
index 2dde3ef3e9..a0eced6c24 100644
--- a/shared-lib/lib-ot/src/core/document/mod.rs
+++ b/shared-lib/lib-ot/src/core/document/mod.rs
@@ -1,14 +1,14 @@
 #![allow(clippy::module_inception)]
 mod attributes;
-mod document;
-mod document_operation;
 mod node;
-mod position;
+mod node_tree;
+mod operation;
+mod path;
 mod transaction;
 
 pub use attributes::*;
-pub use document::*;
-pub use document_operation::*;
 pub use node::*;
-pub use position::*;
+pub use node_tree::*;
+pub use operation::*;
+pub use path::*;
 pub use transaction::*;
diff --git a/shared-lib/lib-ot/src/core/document/node.rs b/shared-lib/lib-ot/src/core/document/node.rs
index 9115f656f4..8b2daec19b 100644
--- a/shared-lib/lib-ot/src/core/document/node.rs
+++ b/shared-lib/lib-ot/src/core/document/node.rs
@@ -18,8 +18,28 @@ impl NodeData {
     }
 }
 
+impl std::convert::From<Node> for NodeData {
+    fn from(node: Node) -> Self {
+        Self {
+            node_type: node.note_type,
+            attributes: node.attributes,
+            delta: node.delta,
+        }
+    }
+}
+
+impl std::convert::From<&Node> for NodeData {
+    fn from(node: &Node) -> Self {
+        Self {
+            node_type: node.note_type.clone(),
+            attributes: node.attributes.clone(),
+            delta: node.delta.clone(),
+        }
+    }
+}
+
 #[derive(Clone, Serialize, Deserialize, Eq, PartialEq)]
-pub struct NodeSubTree {
+pub struct Node {
     #[serde(rename = "type")]
     pub note_type: String,
 
@@ -29,24 +49,16 @@ pub struct NodeSubTree {
     pub delta: Option<TextDelta>,
 
     #[serde(skip_serializing_if = "Vec::is_empty")]
-    pub children: Vec<NodeSubTree>,
+    pub children: Vec<Node>,
 }
 
-impl NodeSubTree {
-    pub fn new(node_type: &str) -> NodeSubTree {
-        NodeSubTree {
+impl Node {
+    pub fn new(node_type: &str) -> Node {
+        Node {
             note_type: node_type.into(),
             attributes: NodeAttributes::new(),
             delta: None,
             children: Vec::new(),
         }
     }
-
-    pub fn to_node_data(&self) -> NodeData {
-        NodeData {
-            node_type: self.note_type.clone(),
-            attributes: self.attributes.clone(),
-            delta: self.delta.clone(),
-        }
-    }
 }
diff --git a/shared-lib/lib-ot/src/core/document/document.rs b/shared-lib/lib-ot/src/core/document/node_tree.rs
similarity index 51%
rename from shared-lib/lib-ot/src/core/document/document.rs
rename to shared-lib/lib-ot/src/core/document/node_tree.rs
index 59758c7ca9..2d1483d59f 100644
--- a/shared-lib/lib-ot/src/core/document/document.rs
+++ b/shared-lib/lib-ot/src/core/document/node_tree.rs
@@ -1,42 +1,43 @@
-use crate::core::document::position::Path;
-use crate::core::{
-    DocumentOperation, NodeAttributes, NodeData, NodeSubTree, OperationTransform, TextDelta, Transaction,
-};
+use crate::core::document::path::Path;
+use crate::core::{Node, NodeAttributes, NodeData, NodeOperation, OperationTransform, TextDelta, Transaction};
 use crate::errors::{ErrorBuilder, OTError, OTErrorCode};
 use indextree::{Arena, Children, FollowingSiblings, NodeId};
 
-pub struct DocumentTree {
+pub struct NodeTree {
     arena: Arena<NodeData>,
     root: NodeId,
 }
 
-impl Default for DocumentTree {
+impl Default for NodeTree {
     fn default() -> Self {
         Self::new()
     }
 }
 
-impl DocumentTree {
-    pub fn new() -> DocumentTree {
+impl NodeTree {
+    pub fn new() -> NodeTree {
         let mut arena = Arena::new();
-
         let root = arena.new_node(NodeData::new("root"));
-        DocumentTree { arena, root }
+        NodeTree { arena, root }
+    }
+
+    pub fn get_node_data(&self, node_id: NodeId) -> Option<&NodeData> {
+        Some(self.arena.get(node_id)?.get())
     }
 
     ///
     /// # Examples
     ///
     /// ```
-    /// use lib_ot::core::{DocumentOperation, DocumentTree, NodeSubTree, Path};
-    /// let nodes = vec![NodeSubTree::new("text")];
+    /// use lib_ot::core::{NodeOperation, NodeTree, Node, Path};
+    /// let nodes = vec![Node::new("text")];
     /// let root_path: Path = vec![0].into();
-    /// let op = DocumentOperation::Insert {path: root_path.clone(),nodes };
+    /// let op = NodeOperation::Insert {path: root_path.clone(),nodes };
     ///
-    /// let mut document = DocumentTree::new();
-    /// document.apply_op(&op).unwrap();
-    /// let node_id = document.node_at_path(&root_path).unwrap();
-    /// let node_path = document.path_of_node(node_id);
+    /// let mut node_tree = NodeTree::new();
+    /// node_tree.apply_op(&op).unwrap();
+    /// let node_id = node_tree.node_at_path(&root_path).unwrap();
+    /// let node_path = node_tree.path_of_node(node_id);
     /// debug_assert_eq!(node_path, root_path);
     /// ```
     pub fn node_at_path<T: Into<Path>>(&self, path: T) -> Option<NodeId> {
@@ -47,23 +48,20 @@ impl DocumentTree {
 
         let mut iterate_node = self.root;
         for id in path.iter() {
-            iterate_node = self.child_from_node_with_index(iterate_node, *id)?;
+            iterate_node = self.child_from_node_at_index(iterate_node, *id)?;
         }
         Some(iterate_node)
     }
 
     pub fn path_of_node(&self, node_id: NodeId) -> Path {
-        let mut path: Vec<usize> = Vec::new();
-        let mut ancestors = node_id.ancestors(&self.arena).skip(1);
+        let mut path = vec![];
         let mut current_node = node_id;
-        let mut parent = ancestors.next();
-
-        while parent.is_some() {
-            let parent_node = parent.unwrap();
+        // Use .skip(1) on the ancestors iterator to skip the root node.
+        let mut ancestors = node_id.ancestors(&self.arena).skip(1);
+        while let Some(parent_node) = ancestors.next() {
             let counter = self.index_of_node(parent_node, current_node);
             path.push(counter);
             current_node = parent_node;
-            parent = ancestors.next();
         }
 
         Path(path)
@@ -71,14 +69,11 @@ impl DocumentTree {
 
     fn index_of_node(&self, parent_node: NodeId, child_node: NodeId) -> usize {
         let mut counter: usize = 0;
-        let mut children_iterator = parent_node.children(&self.arena);
-        let mut node = children_iterator.next();
-        while node.is_some() {
-            if node.unwrap() == child_node {
+        let mut iter = parent_node.children(&self.arena);
+        while let Some(node) = iter.next() {
+            if node == child_node {
                 return counter;
             }
-
-            node = children_iterator.next();
             counter += 1;
         }
 
@@ -88,7 +83,7 @@ impl DocumentTree {
     ///
     /// # Arguments
     ///
-    /// * `at_node`:
+    /// * `node_id`:
     /// * `index`:
     ///
     /// returns: Option<NodeId>
@@ -96,19 +91,19 @@ impl DocumentTree {
     /// # Examples
     ///
     /// ```
-    /// use lib_ot::core::{DocumentOperation, DocumentTree, NodeSubTree, Path};
-    /// let node = NodeSubTree::new("text");
+    /// use lib_ot::core::{NodeOperation, NodeTree, Node, Path};
+    /// let node = Node::new("text");
     /// let inserted_path: Path = vec![0].into();
     ///
-    /// let mut document = DocumentTree::new();
-    /// document.apply_op(&DocumentOperation::Insert {path: inserted_path.clone(),nodes: vec![node.clone()] }).unwrap();
+    /// let mut node_tree = NodeTree::new();
+    /// node_tree.apply_op(&NodeOperation::Insert {path: inserted_path.clone(),nodes: vec![node.clone()] }).unwrap();
     ///
-    /// let inserted_note = document.node_at_path(&inserted_path).unwrap();
-    /// let inserted_data = document.get_node_data(inserted_note).unwrap();
+    /// let inserted_note = node_tree.node_at_path(&inserted_path).unwrap();
+    /// let inserted_data = node_tree.get_node_data(inserted_note).unwrap();
     /// assert_eq!(inserted_data.node_type, node.note_type);
     /// ```
-    pub fn child_from_node_with_index(&self, at_node: NodeId, index: usize) -> Option<NodeId> {
-        let children = at_node.children(&self.arena);
+    pub fn child_from_node_at_index(&self, node_id: NodeId, index: usize) -> Option<NodeId> {
+        let children = node_id.children(&self.arena);
         for (counter, child) in children.enumerate() {
             if counter == index {
                 return Some(child);
@@ -122,10 +117,6 @@ impl DocumentTree {
         node_id.children(&self.arena)
     }
 
-    pub fn get_node_data(&self, node_id: NodeId) -> Option<&NodeData> {
-        Some(self.arena.get(node_id)?.get())
-    }
-
     ///
     /// # Arguments
     ///
@@ -151,16 +142,16 @@ impl DocumentTree {
         Ok(())
     }
 
-    pub fn apply_op(&mut self, op: &DocumentOperation) -> Result<(), OTError> {
+    pub fn apply_op(&mut self, op: &NodeOperation) -> Result<(), OTError> {
         match op {
-            DocumentOperation::Insert { path, nodes } => self.apply_insert(path, nodes),
-            DocumentOperation::Update { path, attributes, .. } => self.apply_update(path, attributes),
-            DocumentOperation::Delete { path, nodes } => self.apply_delete(path, nodes.len()),
-            DocumentOperation::TextEdit { path, delta, .. } => self.apply_text_edit(path, delta),
+            NodeOperation::Insert { path, nodes } => self.insert_nodes(path, nodes),
+            NodeOperation::Update { path, attributes, .. } => self.update_node(path, attributes),
+            NodeOperation::Delete { path, nodes } => self.delete_node(path, nodes),
+            NodeOperation::TextEdit { path, delta, .. } => self.update_delta(path, delta),
         }
     }
 
-    fn apply_insert(&mut self, path: &Path, nodes: &[NodeSubTree]) -> Result<(), OTError> {
+    fn insert_nodes(&mut self, path: &Path, nodes: &[Node]) -> Result<(), OTError> {
         debug_assert!(!path.is_empty());
         if path.is_empty() {
             return Err(OTErrorCode::PathIsEmpty.into());
@@ -172,27 +163,22 @@ impl DocumentTree {
             .node_at_path(parent_path)
             .ok_or_else(|| ErrorBuilder::new(OTErrorCode::PathNotFound).build())?;
 
-        self.insert_child_at_index(parent_node, last_index, nodes)
+        self.insert_nodes_at_index(parent_node, last_index, nodes)
     }
 
-    fn insert_child_at_index(
-        &mut self,
-        parent: NodeId,
-        index: usize,
-        insert_children: &[NodeSubTree],
-    ) -> Result<(), OTError> {
+    fn insert_nodes_at_index(&mut self, parent: NodeId, index: usize, insert_children: &[Node]) -> Result<(), OTError> {
         if index == 0 && parent.children(&self.arena).next().is_none() {
-            self.append_subtree(&parent, insert_children);
+            self.append_nodes(&parent, insert_children);
             return Ok(());
         }
 
         if index == parent.children(&self.arena).count() {
-            self.append_subtree(&parent, insert_children);
+            self.append_nodes(&parent, insert_children);
             return Ok(());
         }
 
         let node_to_insert = self
-            .child_from_node_with_index(parent, index)
+            .child_from_node_at_index(parent, index)
             .ok_or_else(|| ErrorBuilder::new(OTErrorCode::PathNotFound).build())?;
 
         self.insert_subtree_before(&node_to_insert, insert_children);
@@ -200,46 +186,37 @@ impl DocumentTree {
     }
 
     // recursive append the subtrees to the node
-    fn append_subtree(&mut self, parent: &NodeId, insert_children: &[NodeSubTree]) {
+    fn append_nodes(&mut self, parent: &NodeId, insert_children: &[Node]) {
         for child in insert_children {
-            let child_id = self.arena.new_node(child.to_node_data());
+            let child_id = self.arena.new_node(child.into());
             parent.append(child_id, &mut self.arena);
 
-            self.append_subtree(&child_id, &child.children);
+            self.append_nodes(&child_id, &child.children);
         }
     }
 
-    fn insert_subtree_before(&mut self, before: &NodeId, insert_children: &[NodeSubTree]) {
+    fn insert_subtree_before(&mut self, before: &NodeId, insert_children: &[Node]) {
         for child in insert_children {
-            let child_id = self.arena.new_node(child.to_node_data());
+            let child_id = self.arena.new_node(child.into());
             before.insert_before(child_id, &mut self.arena);
 
-            self.append_subtree(&child_id, &child.children);
+            self.append_nodes(&child_id, &child.children);
         }
     }
 
-    fn apply_update(&mut self, path: &Path, attributes: &NodeAttributes) -> Result<(), OTError> {
-        let update_node = self
-            .node_at_path(path)
-            .ok_or_else(|| ErrorBuilder::new(OTErrorCode::PathNotFound).build())?;
-        let node_data = self.arena.get_mut(update_node).unwrap();
-        let new_node = {
-            let old_attributes = &node_data.get().attributes;
-            let new_attributes = NodeAttributes::compose(old_attributes, attributes);
-            NodeData {
-                attributes: new_attributes,
-                ..node_data.get().clone()
-            }
-        };
-        *node_data.get_mut() = new_node;
-        Ok(())
+    fn update_node(&mut self, path: &Path, attributes: &NodeAttributes) -> Result<(), OTError> {
+        self.mut_node_at_path(path, |node_data| {
+            let new_attributes = NodeAttributes::compose(&node_data.attributes, attributes)?;
+            node_data.attributes = new_attributes;
+            Ok(())
+        })
     }
 
-    fn apply_delete(&mut self, path: &Path, len: usize) -> Result<(), OTError> {
+    fn delete_node(&mut self, path: &Path, nodes: &[Node]) -> Result<(), OTError> {
         let mut update_node = self
             .node_at_path(path)
             .ok_or_else(|| ErrorBuilder::new(OTErrorCode::PathNotFound).build())?;
-        for _ in 0..len {
+        for _ in 0..nodes.len() {
             let next = update_node.following_siblings(&self.arena).next();
             update_node.remove_subtree(&mut self.arena);
             if let Some(next_id) = next {
@@ -251,22 +228,35 @@ impl DocumentTree {
         Ok(())
     }
 
-    fn apply_text_edit(&mut self, path: &Path, delta: &TextDelta) -> Result<(), OTError> {
-        let edit_node = self
+    fn update_delta(&mut self, path: &Path, delta: &TextDelta) -> Result<(), OTError> {
+        self.mut_node_at_path(path, |node_data| {
+            if node_data.delta.is_none() {
+                let msg = format!("The delta of the node at path:{:?} should not be empty", path);
+                tracing::error!("{}", msg);
+                return Err(OTError::new(OTErrorCode::UnexpectedEmpty, msg));
+            }
+            let new_delta = node_data.delta.as_ref().unwrap().compose(delta)?;
+            let _ = node_data.delta = Some(new_delta);
+            Ok(())
+        })?;
+
+        Ok(())
+    }
+
+    fn mut_node_at_path<F>(&mut self, path: &Path, f: F) -> Result<(), OTError>
+    where
+        F: Fn(&mut NodeData) -> Result<(), OTError>,
+    {
+        let node_id = self
             .node_at_path(path)
             .ok_or_else(|| ErrorBuilder::new(OTErrorCode::PathNotFound).build())?;
-        let node_data = self.arena.get_mut(edit_node).unwrap();
-        let new_delta = if let Some(old_delta) = &node_data.get().delta {
-            Some(old_delta.compose(delta)?)
-        } else {
-            None
-        };
-        if let Some(new_delta) = new_delta {
-            *node_data.get_mut() = NodeData {
-                delta: Some(new_delta),
-                ..node_data.get().clone()
-            };
-        };
+        match self.arena.get_mut(node_id) {
+            None => tracing::warn!("The path: {:?} does not contain any nodes", path),
+            Some(node) => {
+                let node_data = node.get_mut();
+                let _ = f(node_data)?;
+            }
+        }
         Ok(())
     }
 }
diff --git a/shared-lib/lib-ot/src/core/document/document_operation.rs b/shared-lib/lib-ot/src/core/document/operation.rs
similarity index 52%
rename from shared-lib/lib-ot/src/core/document/document_operation.rs
rename to shared-lib/lib-ot/src/core/document/operation.rs
index 6e34c8cb77..be250a8a19 100644
--- a/shared-lib/lib-ot/src/core/document/document_operation.rs
+++ b/shared-lib/lib-ot/src/core/document/operation.rs
@@ -1,11 +1,11 @@
-use crate::core::document::position::Path;
-use crate::core::{NodeAttributes, NodeSubTree, TextDelta};
+use crate::core::document::path::Path;
+use crate::core::{Node, NodeAttributes, TextDelta};
 
 #[derive(Clone, serde::Serialize, serde::Deserialize)]
 #[serde(tag = "op")]
-pub enum DocumentOperation {
+pub enum NodeOperation {
     #[serde(rename = "insert")]
-    Insert { path: Path, nodes: Vec<NodeSubTree> },
+    Insert { path: Path, nodes: Vec<Node> },
     #[serde(rename = "update")]
     Update {
         path: Path,
@@ -14,7 +14,7 @@ pub enum DocumentOperation {
         old_attributes: NodeAttributes,
     },
     #[serde(rename = "delete")]
-    Delete { path: Path, nodes: Vec<NodeSubTree> },
+    Delete { path: Path, nodes: Vec<Node> },
     #[serde(rename = "text-edit")]
     TextEdit {
         path: Path,
@@ -23,74 +23,74 @@ pub enum DocumentOperation {
     },
 }
 
-impl DocumentOperation {
+impl NodeOperation {
     pub fn path(&self) -> &Path {
         match self {
-            DocumentOperation::Insert { path, .. } => path,
-            DocumentOperation::Update { path, .. } => path,
-            DocumentOperation::Delete { path, .. } => path,
-            DocumentOperation::TextEdit { path, .. } => path,
+            NodeOperation::Insert { path, .. } => path,
+            NodeOperation::Update { path, .. } => path,
+            NodeOperation::Delete { path, .. } => path,
+            NodeOperation::TextEdit { path, .. } => path,
         }
     }
-    pub fn invert(&self) -> DocumentOperation {
+    pub fn invert(&self) -> NodeOperation {
         match self {
-            DocumentOperation::Insert { path, nodes } => DocumentOperation::Delete {
+            NodeOperation::Insert { path, nodes } => NodeOperation::Delete {
                 path: path.clone(),
                 nodes: nodes.clone(),
             },
-            DocumentOperation::Update {
+            NodeOperation::Update {
                 path,
                 attributes,
                 old_attributes,
-            } => DocumentOperation::Update {
+            } => NodeOperation::Update {
                 path: path.clone(),
                 attributes: old_attributes.clone(),
                 old_attributes: attributes.clone(),
             },
-            DocumentOperation::Delete { path, nodes } => DocumentOperation::Insert {
+            NodeOperation::Delete { path, nodes } => NodeOperation::Insert {
                 path: path.clone(),
                 nodes: nodes.clone(),
             },
-            DocumentOperation::TextEdit { path, delta, inverted } => DocumentOperation::TextEdit {
+            NodeOperation::TextEdit { path, delta, inverted } => NodeOperation::TextEdit {
                 path: path.clone(),
                 delta: inverted.clone(),
                 inverted: delta.clone(),
             },
         }
     }
-    pub fn clone_with_new_path(&self, path: Path) -> DocumentOperation {
+    pub fn clone_with_new_path(&self, path: Path) -> NodeOperation {
         match self {
-            DocumentOperation::Insert { nodes, .. } => DocumentOperation::Insert {
+            NodeOperation::Insert { nodes, .. } => NodeOperation::Insert {
                 path,
                 nodes: nodes.clone(),
             },
-            DocumentOperation::Update {
+            NodeOperation::Update {
                 attributes,
                 old_attributes,
                 ..
-            } => DocumentOperation::Update {
+            } => NodeOperation::Update {
                 path,
                 attributes: attributes.clone(),
                 old_attributes: old_attributes.clone(),
             },
-            DocumentOperation::Delete { nodes, .. } => DocumentOperation::Delete {
+            NodeOperation::Delete { nodes, .. } => NodeOperation::Delete {
                 path,
                 nodes: nodes.clone(),
             },
-            DocumentOperation::TextEdit { delta, inverted, .. } => DocumentOperation::TextEdit {
+            NodeOperation::TextEdit { delta, inverted, .. } => NodeOperation::TextEdit {
                 path,
                 delta: delta.clone(),
                 inverted: inverted.clone(),
             },
         }
     }
-    pub fn transform(a: &DocumentOperation, b: &DocumentOperation) -> DocumentOperation {
+    pub fn transform(a: &NodeOperation, b: &NodeOperation) -> NodeOperation {
         match a {
-            DocumentOperation::Insert { path: a_path, nodes } => {
+            NodeOperation::Insert { path: a_path, nodes } => {
                 let new_path = Path::transform(a_path, b.path(), nodes.len() as i64);
                 b.clone_with_new_path(new_path)
             }
-            DocumentOperation::Delete { path: a_path, nodes } => {
+            NodeOperation::Delete { path: a_path, nodes } => {
                 let new_path = Path::transform(a_path, b.path(), nodes.len() as i64);
                 b.clone_with_new_path(new_path)
             }
@@ -101,61 +101,12 @@ impl DocumentOperation {
 
 #[cfg(test)]
 mod tests {
-    use crate::core::{Delta, DocumentOperation, NodeAttributes, NodeSubTree, Path};
-
-    #[test]
-    fn test_transform_path_1() {
-        assert_eq!(
-            { Path::transform(&Path(vec![0, 1]), &Path(vec![0, 1]), 1) }.0,
-            vec![0, 2]
-        );
-    }
-
-    #[test]
-    fn test_transform_path_2() {
-        assert_eq!(
-            { Path::transform(&Path(vec![0, 1]), &Path(vec![0, 2]), 1) }.0,
-            vec![0, 3]
-        );
-    }
-
-    #[test]
-    fn test_transform_path_3() {
-        assert_eq!(
-            { Path::transform(&Path(vec![0, 1]), &Path(vec![0, 2, 7, 8, 9]), 1) }.0,
-            vec![0, 3, 7, 8, 9]
-        );
-    }
-
-    #[test]
-    fn test_transform_path_not_changed() {
-        assert_eq!(
-            { Path::transform(&Path(vec![0, 1, 2]), &Path(vec![0, 0, 7, 8, 9]), 1) }.0,
-            vec![0, 0, 7, 8, 9]
-        );
-        assert_eq!(
-            { Path::transform(&Path(vec![0, 1, 2]), &Path(vec![0, 1]), 1) }.0,
-            vec![0, 1]
-        );
-        assert_eq!(
-            { Path::transform(&Path(vec![1, 1]), &Path(vec![1, 0]), 1) }.0,
-            vec![1, 0]
-        );
-    }
-
-    #[test]
-    fn test_transform_delta() {
-        assert_eq!(
-            { Path::transform(&Path(vec![0, 1]), &Path(vec![0, 1]), 5) }.0,
-            vec![0, 6]
-        );
-    }
-
+    use crate::core::{Delta, Node, NodeAttributes, NodeOperation, Path};
     #[test]
     fn test_serialize_insert_operation() {
-        let insert = DocumentOperation::Insert {
+        let insert = NodeOperation::Insert {
             path: Path(vec![0, 1]),
-            nodes: vec![NodeSubTree::new("text")],
+            nodes: vec![Node::new("text")],
         };
         let result = serde_json::to_string(&insert).unwrap();
         assert_eq!(
@@ -166,13 +117,13 @@ mod tests {
 
     #[test]
     fn test_serialize_insert_sub_trees() {
-        let insert = DocumentOperation::Insert {
+        let insert = NodeOperation::Insert {
             path: Path(vec![0, 1]),
-            nodes: vec![NodeSubTree {
+            nodes: vec![Node {
                 note_type: "text".into(),
                 attributes: NodeAttributes::new(),
                 delta: None,
-                children: vec![NodeSubTree::new("text")],
+                children: vec![Node::new("text")],
             }],
         };
         let result = serde_json::to_string(&insert).unwrap();
@@ -184,7 +135,7 @@ mod tests {
 
     #[test]
     fn test_serialize_update_operation() {
-        let insert = DocumentOperation::Update {
+        let insert = NodeOperation::Update {
             path: Path(vec![0, 1]),
             attributes: NodeAttributes::new(),
             old_attributes: NodeAttributes::new(),
@@ -198,7 +149,7 @@ mod tests {
 
     #[test]
     fn test_serialize_text_edit_operation() {
-        let insert = DocumentOperation::TextEdit {
+        let insert = NodeOperation::TextEdit {
             path: Path(vec![0, 1]),
             delta: Delta::new(),
             inverted: Delta::new(),
diff --git a/shared-lib/lib-ot/src/core/document/position.rs b/shared-lib/lib-ot/src/core/document/path.rs
similarity index 61%
rename from shared-lib/lib-ot/src/core/document/position.rs
rename to shared-lib/lib-ot/src/core/document/path.rs
index c098096569..ed1770d290 100644
--- a/shared-lib/lib-ot/src/core/document/position.rs
+++ b/shared-lib/lib-ot/src/core/document/path.rs
@@ -76,3 +76,52 @@ impl Path {
         Path(prefix)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::core::Path;
+    #[test]
+    fn path_transform_test_1() {
+        assert_eq!(
+            { Path::transform(&Path(vec![0, 1]), &Path(vec![0, 1]), 1) }.0,
+            vec![0, 2]
+        );
+
+        assert_eq!(
+            { Path::transform(&Path(vec![0, 1]), &Path(vec![0, 1]), 5) }.0,
+            vec![0, 6]
+        );
+    }
+
+    #[test]
+    fn path_transform_test_2() {
+        assert_eq!(
+            { Path::transform(&Path(vec![0, 1]), &Path(vec![0, 2]), 1) }.0,
+            vec![0, 3]
+        );
+    }
+
+    #[test]
+    fn path_transform_test_3() {
+        assert_eq!(
+            { Path::transform(&Path(vec![0, 1]), &Path(vec![0, 2, 7, 8, 9]), 1) }.0,
+            vec![0, 3, 7, 8, 9]
+        );
+    }
+
+    #[test]
+    fn path_transform_no_changed_test() {
+        assert_eq!(
+            { Path::transform(&Path(vec![0, 1, 2]), &Path(vec![0, 0, 7, 8, 9]), 1) }.0,
+            vec![0, 0, 7, 8, 9]
+        );
+        assert_eq!(
+            { Path::transform(&Path(vec![0, 1, 2]), &Path(vec![0, 1]), 1) }.0,
+            vec![0, 1]
+        );
+        assert_eq!(
+            { Path::transform(&Path(vec![1, 1]), &Path(vec![1, 0]), 1) }.0,
+            vec![1, 0]
+        );
+    }
+}
diff --git a/shared-lib/lib-ot/src/core/document/transaction.rs b/shared-lib/lib-ot/src/core/document/transaction.rs
index a99ab66dac..755e9419de 100644
--- a/shared-lib/lib-ot/src/core/document/transaction.rs
+++ b/shared-lib/lib-ot/src/core/document/transaction.rs
@@ -1,26 +1,26 @@
-use crate::core::document::position::Path;
-use crate::core::{AttributeMap, DocumentOperation, DocumentTree, NodeAttributes, NodeSubTree};
+use crate::core::document::path::Path;
+use crate::core::{Node, NodeAttributes, NodeOperation, NodeTree};
 use indextree::NodeId;
 
 pub struct Transaction {
-    pub operations: Vec<DocumentOperation>,
+    pub operations: Vec<NodeOperation>,
 }
 
 impl Transaction {
-    fn new(operations: Vec<DocumentOperation>) -> Transaction {
+    fn new(operations: Vec<NodeOperation>) -> Transaction {
         Transaction { operations }
     }
 }
 
 pub struct TransactionBuilder<'a> {
-    document: &'a DocumentTree,
-    operations: Vec<DocumentOperation>,
+    node_tree: &'a NodeTree,
+    operations: Vec<NodeOperation>,
 }
 
 impl<'a> TransactionBuilder<'a> {
-    pub fn new(document: &'a DocumentTree) -> TransactionBuilder {
+    pub fn new(node_tree: &'a NodeTree) -> TransactionBuilder {
         TransactionBuilder {
-            document,
+            node_tree,
             operations: Vec::new(),
         }
     }
@@ -38,18 +38,18 @@ impl<'a> TransactionBuilder<'a> {
     /// // -- 0 (root)
     /// //      0 -- text_1
     /// //      1 -- text_2
-    /// use lib_ot::core::{DocumentTree, NodeSubTree, TransactionBuilder};
-    /// let mut document = DocumentTree::new();
-    /// let transaction = TransactionBuilder::new(&document)
-    ///     .insert_nodes_at_path(0,vec![ NodeSubTree::new("text_1"),  NodeSubTree::new("text_2")])
+    /// use lib_ot::core::{NodeTree, Node, TransactionBuilder};
+    /// let mut node_tree = NodeTree::new();
+    /// let transaction = TransactionBuilder::new(&node_tree)
+    ///     .insert_nodes_at_path(0,vec![ Node::new("text_1"),  Node::new("text_2")])
     ///     .finalize();
-    ///  document.apply(transaction).unwrap();
+    ///  node_tree.apply(transaction).unwrap();
     ///
-    ///  document.node_at_path(vec![0, 0]);
+    ///  node_tree.node_at_path(vec![0, 0]);
     /// ```
     ///
-    pub fn insert_nodes_at_path<T: Into<Path>>(self, path: T, nodes: Vec<NodeSubTree>) -> Self {
-        self.push(DocumentOperation::Insert {
+    pub fn insert_nodes_at_path<T: Into<Path>>(self, path: T, nodes: Vec<Node>) -> Self {
+        self.push(NodeOperation::Insert {
             path: path.into(),
             nodes,
         })
@@ -68,36 +68,34 @@ impl<'a> TransactionBuilder<'a> {
     /// // 0
     /// // -- 0
     /// //    |-- text
-    /// use lib_ot::core::{DocumentTree, NodeSubTree, TransactionBuilder};
-    /// let mut document = DocumentTree::new();
-    /// let transaction = TransactionBuilder::new(&document)
-    ///     .insert_node_at_path(0, NodeSubTree::new("text"))
+    /// use lib_ot::core::{NodeTree, Node, TransactionBuilder};
+    /// let mut node_tree = NodeTree::new();
+    /// let transaction = TransactionBuilder::new(&node_tree)
+    ///     .insert_node_at_path(0, Node::new("text"))
     ///     .finalize();
-    ///  document.apply(transaction).unwrap();
+    ///  node_tree.apply(transaction).unwrap();
     /// ```
     ///
-    pub fn insert_node_at_path<T: Into<Path>>(self, path: T, node: NodeSubTree) -> Self {
+    pub fn insert_node_at_path<T: Into<Path>>(self, path: T, node: Node) -> Self {
         self.insert_nodes_at_path(path, vec![node])
     }
 
-    pub fn update_attributes_at_path(self, path: &Path, attributes: AttributeMap) -> Self {
-        let mut old_attributes: AttributeMap = AttributeMap::new();
-        let node = self.document.node_at_path(path).unwrap();
-        let node_data = self.document.get_node_data(node).unwrap();
+    pub fn update_attributes_at_path(self, path: &Path, attributes: NodeAttributes) -> Self {
+        let mut old_attributes = NodeAttributes::new();
+        let node = self.node_tree.node_at_path(path).unwrap();
+        let node_data = self.node_tree.get_node_data(node).unwrap();
 
         for key in attributes.keys() {
             let old_attrs = &node_data.attributes;
-            let old_value = match old_attrs.0.get(key.as_str()) {
-                Some(value) => value.clone(),
-                None => None,
-            };
-            old_attributes.insert(key.clone(), old_value);
+            if let Some(value) = old_attrs.get(key.as_str()) {
+                old_attributes.insert(key.clone(), value.clone());
+            }
         }
 
-        self.push(DocumentOperation::Update {
+        self.push(NodeOperation::Update {
             path: path.clone(),
-            attributes: NodeAttributes(attributes),
-            old_attributes: NodeAttributes(old_attributes),
+            attributes,
+            old_attributes,
         })
     }
 
@@ -106,29 +104,29 @@ impl<'a> TransactionBuilder<'a> {
     }
 
     pub fn delete_nodes_at_path(mut self, path: &Path, length: usize) -> Self {
-        let mut node = self.document.node_at_path(path).unwrap();
+        let mut node = self.node_tree.node_at_path(path).unwrap();
         let mut deleted_nodes = vec![];
         for _ in 0..length {
             deleted_nodes.push(self.get_deleted_nodes(node));
-            node = self.document.following_siblings(node).next().unwrap();
+            node = self.node_tree.following_siblings(node).next().unwrap();
         }
 
-        self.operations.push(DocumentOperation::Delete {
+        self.operations.push(NodeOperation::Delete {
             path: path.clone(),
             nodes: deleted_nodes,
         });
         self
     }
 
-    fn get_deleted_nodes(&self, node_id: NodeId) -> NodeSubTree {
-        let node_data = self.document.get_node_data(node_id).unwrap();
+    fn get_deleted_nodes(&self, node_id: NodeId) -> Node {
+        let node_data = self.node_tree.get_node_data(node_id).unwrap();
 
         let mut children = vec![];
-        self.document.children_from_node(node_id).for_each(|child_id| {
+        self.node_tree.children_from_node(node_id).for_each(|child_id| {
             children.push(self.get_deleted_nodes(child_id));
         });
 
-        NodeSubTree {
+        Node {
             note_type: node_data.node_type.clone(),
             attributes: node_data.attributes.clone(),
             delta: node_data.delta.clone(),
@@ -136,7 +134,7 @@ impl<'a> TransactionBuilder<'a> {
         }
     }
 
-    pub fn push(mut self, op: DocumentOperation) -> Self {
+    pub fn push(mut self, op: NodeOperation) -> Self {
         self.operations.push(op);
         self
     }
diff --git a/shared-lib/lib-ot/src/core/operation/builder.rs b/shared-lib/lib-ot/src/core/operation/builder.rs
index c4f9cc8277..b5a06484eb 100644
--- a/shared-lib/lib-ot/src/core/operation/builder.rs
+++ b/shared-lib/lib-ot/src/core/operation/builder.rs
@@ -1,7 +1,7 @@
 use crate::core::operation::{Attributes, Operation, PhantomAttributes};
-use crate::rich_text::RichTextAttributes;
+use crate::rich_text::TextAttributes;
 
-pub type RichTextOpBuilder = OperationsBuilder<RichTextAttributes>;
+pub type RichTextOpBuilder = OperationsBuilder<TextAttributes>;
 pub type PlainTextOpBuilder = OperationsBuilder<PhantomAttributes>;
 
 #[derive(Default)]
diff --git a/shared-lib/lib-ot/src/core/operation/operation.rs b/shared-lib/lib-ot/src/core/operation/operation.rs
index 4bacd1ea7d..48899ef8ce 100644
--- a/shared-lib/lib-ot/src/core/operation/operation.rs
+++ b/shared-lib/lib-ot/src/core/operation/operation.rs
@@ -64,7 +64,7 @@ pub trait OperationTransform {
     fn invert(&self, other: &Self) -> Self;
 }
 
-/// Each operation can carry attributes. For example, the [RichTextAttributes] has a list of key/value attributes.
+/// Each operation can carry attributes. For example, the [TextAttributes] has a list of key/value attributes.
 /// Such as { bold: true, italic: true }.  
 ///
 ///Because [Operation] is generic over the T, so you must specify the T. For example, the [TextDelta] uses
diff --git a/shared-lib/lib-ot/src/errors.rs b/shared-lib/lib-ot/src/errors.rs
index 449c662883..fe2a03b206 100644
--- a/shared-lib/lib-ot/src/errors.rs
+++ b/shared-lib/lib-ot/src/errors.rs
@@ -25,11 +25,8 @@ impl std::convert::From<OTErrorCode> for OTError {
 }
 
 impl OTError {
-    pub fn new(code: OTErrorCode, msg: &str) -> OTError {
-        Self {
-            code,
-            msg: msg.to_owned(),
-        }
+    pub fn new(code: OTErrorCode, msg: String) -> OTError {
+        Self { code, msg }
     }
 
     pub fn context<T: Debug>(mut self, error: T) -> Self {
@@ -76,6 +73,7 @@ pub enum OTErrorCode {
     Internal,
     PathNotFound,
     PathIsEmpty,
+    UnexpectedEmpty,
 }
 
 pub struct ErrorBuilder {
@@ -105,6 +103,6 @@ impl ErrorBuilder {
     }
 
     pub fn build(mut self) -> OTError {
-        OTError::new(self.code, &self.msg.take().unwrap_or_else(|| "".to_owned()))
+        OTError::new(self.code, self.msg.take().unwrap_or_else(|| "".to_owned()))
     }
 }
diff --git a/shared-lib/lib-ot/src/rich_text/attributes.rs b/shared-lib/lib-ot/src/rich_text/attributes.rs
index be3b1bbf59..f862dab4f3 100644
--- a/shared-lib/lib-ot/src/rich_text/attributes.rs
+++ b/shared-lib/lib-ot/src/rich_text/attributes.rs
@@ -10,19 +10,19 @@ use std::{
 };
 use strum_macros::Display;
 
-pub type RichTextOperation = Operation<RichTextAttributes>;
+pub type RichTextOperation = Operation<TextAttributes>;
 impl RichTextOperation {
-    pub fn contain_attribute(&self, attribute: &RichTextAttribute) -> bool {
+    pub fn contain_attribute(&self, attribute: &TextAttribute) -> bool {
         self.get_attributes().contains_key(&attribute.key)
     }
 }
 
 #[derive(Debug, Clone, Eq, PartialEq)]
-pub struct RichTextAttributes {
-    pub(crate) inner: HashMap<RichTextAttributeKey, RichTextAttributeValue>,
+pub struct TextAttributes {
+    pub(crate) inner: HashMap<TextAttributeKey, TextAttributeValue>,
 }
 
-impl std::default::Default for RichTextAttributes {
+impl std::default::Default for TextAttributes {
     fn default() -> Self {
         Self {
             inner: HashMap::with_capacity(0),
@@ -30,40 +30,40 @@ impl std::default::Default for RichTextAttributes {
     }
 }
 
-impl fmt::Display for RichTextAttributes {
+impl fmt::Display for TextAttributes {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.write_fmt(format_args!("{:?}", self.inner))
     }
 }
 
 #[inline(always)]
-pub fn plain_attributes() -> RichTextAttributes {
-    RichTextAttributes::default()
+pub fn plain_attributes() -> TextAttributes {
+    TextAttributes::default()
 }
 
-impl RichTextAttributes {
+impl TextAttributes {
     pub fn new() -> Self {
-        RichTextAttributes { inner: HashMap::new() }
+        TextAttributes { inner: HashMap::new() }
     }
 
     pub fn is_empty(&self) -> bool {
         self.inner.is_empty()
     }
 
-    pub fn add(&mut self, attribute: RichTextAttribute) {
-        let RichTextAttribute { key, value, scope: _ } = attribute;
+    pub fn add(&mut self, attribute: TextAttribute) {
+        let TextAttribute { key, value, scope: _ } = attribute;
         self.inner.insert(key, value);
     }
 
-    pub fn insert(&mut self, key: RichTextAttributeKey, value: RichTextAttributeValue) {
+    pub fn insert(&mut self, key: TextAttributeKey, value: TextAttributeValue) {
         self.inner.insert(key, value);
     }
 
-    pub fn delete(&mut self, key: &RichTextAttributeKey) {
-        self.inner.insert(key.clone(), RichTextAttributeValue(None));
+    pub fn delete(&mut self, key: &TextAttributeKey) {
+        self.inner.insert(key.clone(), TextAttributeValue(None));
     }
 
-    pub fn mark_all_as_removed_except(&mut self, attribute: Option<RichTextAttributeKey>) {
+    pub fn mark_all_as_removed_except(&mut self, attribute: Option<TextAttributeKey>) {
         match attribute {
             None => {
                 self.inner.iter_mut().for_each(|(_k, v)| v.0 = None);
@@ -78,7 +78,7 @@ impl RichTextAttributes {
         }
     }
 
-    pub fn remove(&mut self, key: RichTextAttributeKey) {
+    pub fn remove(&mut self, key: TextAttributeKey) {
         self.inner.retain(|k, _| k != &key);
     }
 
@@ -95,7 +95,7 @@ impl RichTextAttributes {
 
     // Update inner by constructing new attributes from the other if it's
     // not None and replace the key/value with self key/value.
-    pub fn merge(&mut self, other: Option<RichTextAttributes>) {
+    pub fn merge(&mut self, other: Option<TextAttributes>) {
         if other.is_none() {
             return;
         }
@@ -108,7 +108,7 @@ impl RichTextAttributes {
     }
 }
 
-impl Attributes for RichTextAttributes {
+impl Attributes for TextAttributes {
     fn is_empty(&self) -> bool {
         self.inner.is_empty()
     }
@@ -122,7 +122,7 @@ impl Attributes for RichTextAttributes {
     }
 }
 
-impl OperationTransform for RichTextAttributes {
+impl OperationTransform for TextAttributes {
     fn compose(&self, other: &Self) -> Result<Self, OTError>
     where
         Self: Sized,
@@ -136,29 +136,25 @@ impl OperationTransform for RichTextAttributes {
     where
         Self: Sized,
     {
-        let a = self
-            .iter()
-            .fold(RichTextAttributes::new(), |mut new_attributes, (k, v)| {
-                if !other.contains_key(k) {
-                    new_attributes.insert(k.clone(), v.clone());
-                }
-                new_attributes
-            });
+        let a = self.iter().fold(TextAttributes::new(), |mut new_attributes, (k, v)| {
+            if !other.contains_key(k) {
+                new_attributes.insert(k.clone(), v.clone());
+            }
+            new_attributes
+        });
 
-        let b = other
-            .iter()
-            .fold(RichTextAttributes::new(), |mut new_attributes, (k, v)| {
-                if !self.contains_key(k) {
-                    new_attributes.insert(k.clone(), v.clone());
-                }
-                new_attributes
-            });
+        let b = other.iter().fold(TextAttributes::new(), |mut new_attributes, (k, v)| {
+            if !self.contains_key(k) {
+                new_attributes.insert(k.clone(), v.clone());
+            }
+            new_attributes
+        });
 
         Ok((a, b))
     }
 
     fn invert(&self, other: &Self) -> Self {
-        let base_inverted = other.iter().fold(RichTextAttributes::new(), |mut attributes, (k, v)| {
+        let base_inverted = other.iter().fold(TextAttributes::new(), |mut attributes, (k, v)| {
             if other.get(k) != self.get(k) && self.contains_key(k) {
                 attributes.insert(k.clone(), v.clone());
             }
@@ -176,34 +172,34 @@ impl OperationTransform for RichTextAttributes {
     }
 }
 
-impl std::ops::Deref for RichTextAttributes {
-    type Target = HashMap<RichTextAttributeKey, RichTextAttributeValue>;
+impl std::ops::Deref for TextAttributes {
+    type Target = HashMap<TextAttributeKey, TextAttributeValue>;
 
     fn deref(&self) -> &Self::Target {
         &self.inner
     }
 }
 
-impl std::ops::DerefMut for RichTextAttributes {
+impl std::ops::DerefMut for TextAttributes {
     fn deref_mut(&mut self) -> &mut Self::Target {
         &mut self.inner
     }
 }
 
-pub fn attributes_except_header(op: &RichTextOperation) -> RichTextAttributes {
+pub fn attributes_except_header(op: &RichTextOperation) -> TextAttributes {
     let mut attributes = op.get_attributes();
-    attributes.remove(RichTextAttributeKey::Header);
+    attributes.remove(TextAttributeKey::Header);
     attributes
 }
 
 #[derive(Debug, Clone)]
-pub struct RichTextAttribute {
-    pub key: RichTextAttributeKey,
-    pub value: RichTextAttributeValue,
+pub struct TextAttribute {
+    pub key: TextAttributeKey,
+    pub value: TextAttributeValue,
     pub scope: AttributeScope,
 }
 
-impl RichTextAttribute {
+impl TextAttribute {
     // inline
     inline_attribute!(Bold, bool);
     inline_attribute!(Italic, bool);
@@ -245,16 +241,16 @@ impl RichTextAttribute {
     }
 }
 
-impl fmt::Display for RichTextAttribute {
+impl fmt::Display for TextAttribute {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         let s = format!("{:?}:{:?} {:?}", self.key, self.value.0, self.scope);
         f.write_str(&s)
     }
 }
 
-impl std::convert::From<RichTextAttribute> for RichTextAttributes {
-    fn from(attr: RichTextAttribute) -> Self {
-        let mut attributes = RichTextAttributes::new();
+impl std::convert::From<TextAttribute> for TextAttributes {
+    fn from(attr: TextAttribute) -> Self {
+        let mut attributes = TextAttributes::new();
         attributes.add(attr);
         attributes
     }
@@ -263,7 +259,7 @@ impl std::convert::From<RichTextAttribute> for RichTextAttributes {
 #[derive(Clone, Debug, Display, Hash, Eq, PartialEq, serde::Serialize, serde::Deserialize)]
 // serde.rs/variant-attrs.html
 // #[serde(rename_all = "snake_case")]
-pub enum RichTextAttributeKey {
+pub enum TextAttributeKey {
     #[serde(rename = "bold")]
     Bold,
     #[serde(rename = "italic")]
@@ -304,90 +300,90 @@ pub enum RichTextAttributeKey {
 
 // pub trait AttributeValueData<'a>: Serialize + Deserialize<'a> {}
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct RichTextAttributeValue(pub Option<String>);
+pub struct TextAttributeValue(pub Option<String>);
 
-impl std::convert::From<&usize> for RichTextAttributeValue {
+impl std::convert::From<&usize> for TextAttributeValue {
     fn from(val: &usize) -> Self {
-        RichTextAttributeValue::from(*val)
+        TextAttributeValue::from(*val)
     }
 }
 
-impl std::convert::From<usize> for RichTextAttributeValue {
+impl std::convert::From<usize> for TextAttributeValue {
     fn from(val: usize) -> Self {
         if val > 0_usize {
-            RichTextAttributeValue(Some(format!("{}", val)))
+            TextAttributeValue(Some(format!("{}", val)))
         } else {
-            RichTextAttributeValue(None)
+            TextAttributeValue(None)
         }
     }
 }
 
-impl std::convert::From<&str> for RichTextAttributeValue {
+impl std::convert::From<&str> for TextAttributeValue {
     fn from(val: &str) -> Self {
         val.to_owned().into()
     }
 }
 
-impl std::convert::From<String> for RichTextAttributeValue {
+impl std::convert::From<String> for TextAttributeValue {
     fn from(val: String) -> Self {
         if val.is_empty() {
-            RichTextAttributeValue(None)
+            TextAttributeValue(None)
         } else {
-            RichTextAttributeValue(Some(val))
+            TextAttributeValue(Some(val))
         }
     }
 }
 
-impl std::convert::From<&bool> for RichTextAttributeValue {
+impl std::convert::From<&bool> for TextAttributeValue {
     fn from(val: &bool) -> Self {
-        RichTextAttributeValue::from(*val)
+        TextAttributeValue::from(*val)
     }
 }
 
-impl std::convert::From<bool> for RichTextAttributeValue {
+impl std::convert::From<bool> for TextAttributeValue {
     fn from(val: bool) -> Self {
         let val = match val {
             true => Some("true".to_owned()),
             false => None,
         };
-        RichTextAttributeValue(val)
+        TextAttributeValue(val)
     }
 }
 
-pub fn is_block_except_header(k: &RichTextAttributeKey) -> bool {
-    if k == &RichTextAttributeKey::Header {
+pub fn is_block_except_header(k: &TextAttributeKey) -> bool {
+    if k == &TextAttributeKey::Header {
         return false;
     }
     BLOCK_KEYS.contains(k)
 }
 
-pub fn is_block(k: &RichTextAttributeKey) -> bool {
+pub fn is_block(k: &TextAttributeKey) -> bool {
     BLOCK_KEYS.contains(k)
 }
 
 lazy_static! {
-    static ref BLOCK_KEYS: HashSet<RichTextAttributeKey> = HashSet::from_iter(vec![
-        RichTextAttributeKey::Header,
-        RichTextAttributeKey::Indent,
-        RichTextAttributeKey::Align,
-        RichTextAttributeKey::CodeBlock,
-        RichTextAttributeKey::List,
-        RichTextAttributeKey::BlockQuote,
+    static ref BLOCK_KEYS: HashSet<TextAttributeKey> = HashSet::from_iter(vec![
+        TextAttributeKey::Header,
+        TextAttributeKey::Indent,
+        TextAttributeKey::Align,
+        TextAttributeKey::CodeBlock,
+        TextAttributeKey::List,
+        TextAttributeKey::BlockQuote,
     ]);
-    static ref INLINE_KEYS: HashSet<RichTextAttributeKey> = HashSet::from_iter(vec![
-        RichTextAttributeKey::Bold,
-        RichTextAttributeKey::Italic,
-        RichTextAttributeKey::Underline,
-        RichTextAttributeKey::StrikeThrough,
-        RichTextAttributeKey::Link,
-        RichTextAttributeKey::Color,
-        RichTextAttributeKey::Font,
-        RichTextAttributeKey::Size,
-        RichTextAttributeKey::Background,
-        RichTextAttributeKey::InlineCode,
+    static ref INLINE_KEYS: HashSet<TextAttributeKey> = HashSet::from_iter(vec![
+        TextAttributeKey::Bold,
+        TextAttributeKey::Italic,
+        TextAttributeKey::Underline,
+        TextAttributeKey::StrikeThrough,
+        TextAttributeKey::Link,
+        TextAttributeKey::Color,
+        TextAttributeKey::Font,
+        TextAttributeKey::Size,
+        TextAttributeKey::Background,
+        TextAttributeKey::InlineCode,
     ]);
-    static ref INGORE_KEYS: HashSet<RichTextAttributeKey> =
-        HashSet::from_iter(vec![RichTextAttributeKey::Width, RichTextAttributeKey::Height,]);
+    static ref INGORE_KEYS: HashSet<TextAttributeKey> =
+        HashSet::from_iter(vec![TextAttributeKey::Width, TextAttributeKey::Height,]);
 }
 
 #[derive(Debug, PartialEq, Eq, Clone)]
diff --git a/shared-lib/lib-ot/src/rich_text/attributes_serde.rs b/shared-lib/lib-ot/src/rich_text/attributes_serde.rs
index 19ffb5a416..42c8c73834 100644
--- a/shared-lib/lib-ot/src/rich_text/attributes_serde.rs
+++ b/shared-lib/lib-ot/src/rich_text/attributes_serde.rs
@@ -1,5 +1,5 @@
 #[rustfmt::skip]
-use crate::rich_text::{RichTextAttribute, RichTextAttributeKey, RichTextAttributes, RichTextAttributeValue};
+use crate::rich_text::{TextAttribute, TextAttributeKey, TextAttributes, TextAttributeValue};
 use serde::{
     de,
     de::{MapAccess, Visitor},
@@ -8,7 +8,7 @@ use serde::{
 };
 use std::fmt;
 
-impl Serialize for RichTextAttribute {
+impl Serialize for TextAttribute {
     fn serialize<S>(&self, serializer: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
     where
         S: Serializer,
@@ -19,7 +19,7 @@ impl Serialize for RichTextAttribute {
     }
 }
 
-impl Serialize for RichTextAttributes {
+impl Serialize for TextAttributes {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
     where
         S: Serializer,
@@ -36,43 +36,39 @@ impl Serialize for RichTextAttributes {
     }
 }
 
-fn serial_attribute<S, E>(
-    map_serializer: &mut S,
-    key: &RichTextAttributeKey,
-    value: &RichTextAttributeValue,
-) -> Result<(), E>
+fn serial_attribute<S, E>(map_serializer: &mut S, key: &TextAttributeKey, value: &TextAttributeValue) -> Result<(), E>
 where
     S: SerializeMap,
     E: From<<S as SerializeMap>::Error>,
 {
     if let Some(v) = &value.0 {
         match key {
-            RichTextAttributeKey::Bold
-            | RichTextAttributeKey::Italic
-            | RichTextAttributeKey::Underline
-            | RichTextAttributeKey::StrikeThrough
-            | RichTextAttributeKey::CodeBlock
-            | RichTextAttributeKey::InlineCode
-            | RichTextAttributeKey::BlockQuote => match &v.parse::<bool>() {
+            TextAttributeKey::Bold
+            | TextAttributeKey::Italic
+            | TextAttributeKey::Underline
+            | TextAttributeKey::StrikeThrough
+            | TextAttributeKey::CodeBlock
+            | TextAttributeKey::InlineCode
+            | TextAttributeKey::BlockQuote => match &v.parse::<bool>() {
                 Ok(value) => map_serializer.serialize_entry(&key, value)?,
                 Err(e) => log::error!("Serial {:?} failed. {:?}", &key, e),
             },
 
-            RichTextAttributeKey::Font
-            | RichTextAttributeKey::Size
-            | RichTextAttributeKey::Header
-            | RichTextAttributeKey::Indent
-            | RichTextAttributeKey::Width
-            | RichTextAttributeKey::Height => match &v.parse::<i32>() {
+            TextAttributeKey::Font
+            | TextAttributeKey::Size
+            | TextAttributeKey::Header
+            | TextAttributeKey::Indent
+            | TextAttributeKey::Width
+            | TextAttributeKey::Height => match &v.parse::<i32>() {
                 Ok(value) => map_serializer.serialize_entry(&key, value)?,
                 Err(e) => log::error!("Serial {:?} failed. {:?}", &key, e),
             },
 
-            RichTextAttributeKey::Link
-            | RichTextAttributeKey::Color
-            | RichTextAttributeKey::Background
-            | RichTextAttributeKey::Align
-            | RichTextAttributeKey::List => {
+            TextAttributeKey::Link
+            | TextAttributeKey::Color
+            | TextAttributeKey::Background
+            | TextAttributeKey::Align
+            | TextAttributeKey::List => {
                 map_serializer.serialize_entry(&key, v)?;
             }
         }
@@ -82,14 +78,14 @@ where
     Ok(())
 }
 
-impl<'de> Deserialize<'de> for RichTextAttributes {
-    fn deserialize<D>(deserializer: D) -> Result<RichTextAttributes, D::Error>
+impl<'de> Deserialize<'de> for TextAttributes {
+    fn deserialize<D>(deserializer: D) -> Result<TextAttributes, D::Error>
     where
         D: Deserializer<'de>,
     {
         struct AttributesVisitor;
         impl<'de> Visitor<'de> for AttributesVisitor {
-            type Value = RichTextAttributes;
+            type Value = TextAttributes;
             fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
                 formatter.write_str("Expect map")
             }
@@ -98,9 +94,9 @@ impl<'de> Deserialize<'de> for RichTextAttributes {
             where
                 A: MapAccess<'de>,
             {
-                let mut attributes = RichTextAttributes::new();
-                while let Some(key) = map.next_key::<RichTextAttributeKey>()? {
-                    let value = map.next_value::<RichTextAttributeValue>()?;
+                let mut attributes = TextAttributes::new();
+                while let Some(key) = map.next_key::<TextAttributeKey>()? {
+                    let value = map.next_value::<TextAttributeValue>()?;
                     attributes.insert(key, value);
                 }
 
@@ -111,7 +107,7 @@ impl<'de> Deserialize<'de> for RichTextAttributes {
     }
 }
 
-impl Serialize for RichTextAttributeValue {
+impl Serialize for TextAttributeValue {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
     where
         S: Serializer,
@@ -123,14 +119,14 @@ impl Serialize for RichTextAttributeValue {
     }
 }
 
-impl<'de> Deserialize<'de> for RichTextAttributeValue {
-    fn deserialize<D>(deserializer: D) -> Result<RichTextAttributeValue, D::Error>
+impl<'de> Deserialize<'de> for TextAttributeValue {
+    fn deserialize<D>(deserializer: D) -> Result<TextAttributeValue, D::Error>
     where
         D: Deserializer<'de>,
     {
         struct AttributeValueVisitor;
         impl<'de> Visitor<'de> for AttributeValueVisitor {
-            type Value = RichTextAttributeValue;
+            type Value = TextAttributeValue;
             fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
                 formatter.write_str("bool, usize or string")
             }
@@ -145,56 +141,56 @@ impl<'de> Deserialize<'de> for RichTextAttributeValue {
             where
                 E: de::Error,
             {
-                Ok(RichTextAttributeValue(Some(format!("{}", value))))
+                Ok(TextAttributeValue(Some(format!("{}", value))))
             }
 
             fn visit_i16<E>(self, value: i16) -> Result<Self::Value, E>
             where
                 E: de::Error,
             {
-                Ok(RichTextAttributeValue(Some(format!("{}", value))))
+                Ok(TextAttributeValue(Some(format!("{}", value))))
             }
 
             fn visit_i32<E>(self, value: i32) -> Result<Self::Value, E>
             where
                 E: de::Error,
             {
-                Ok(RichTextAttributeValue(Some(format!("{}", value))))
+                Ok(TextAttributeValue(Some(format!("{}", value))))
             }
 
             fn visit_i64<E>(self, value: i64) -> Result<Self::Value, E>
             where
                 E: de::Error,
             {
-                Ok(RichTextAttributeValue(Some(format!("{}", value))))
+                Ok(TextAttributeValue(Some(format!("{}", value))))
             }
 
             fn visit_u8<E>(self, value: u8) -> Result<Self::Value, E>
             where
                 E: de::Error,
             {
-                Ok(RichTextAttributeValue(Some(format!("{}", value))))
+                Ok(TextAttributeValue(Some(format!("{}", value))))
             }
 
             fn visit_u16<E>(self, value: u16) -> Result<Self::Value, E>
             where
                 E: de::Error,
             {
-                Ok(RichTextAttributeValue(Some(format!("{}", value))))
+                Ok(TextAttributeValue(Some(format!("{}", value))))
             }
 
             fn visit_u32<E>(self, value: u32) -> Result<Self::Value, E>
             where
                 E: de::Error,
             {
-                Ok(RichTextAttributeValue(Some(format!("{}", value))))
+                Ok(TextAttributeValue(Some(format!("{}", value))))
             }
 
             fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
             where
                 E: de::Error,
             {
-                Ok(RichTextAttributeValue(Some(format!("{}", value))))
+                Ok(TextAttributeValue(Some(format!("{}", value))))
             }
 
             fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
@@ -208,7 +204,7 @@ impl<'de> Deserialize<'de> for RichTextAttributeValue {
             where
                 E: de::Error,
             {
-                Ok(RichTextAttributeValue(None))
+                Ok(TextAttributeValue(None))
             }
 
             fn visit_unit<E>(self) -> Result<Self::Value, E>
@@ -216,7 +212,7 @@ impl<'de> Deserialize<'de> for RichTextAttributeValue {
                 E: de::Error,
             {
                 // the value that contains null will be processed here.
-                Ok(RichTextAttributeValue(None))
+                Ok(TextAttributeValue(None))
             }
 
             fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error>
@@ -225,7 +221,7 @@ impl<'de> Deserialize<'de> for RichTextAttributeValue {
             {
                 // https://github.com/serde-rs/json/issues/505
                 let mut map = map;
-                let value = map.next_value::<RichTextAttributeValue>()?;
+                let value = map.next_value::<TextAttributeValue>()?;
                 Ok(value)
             }
         }
diff --git a/shared-lib/lib-ot/src/rich_text/builder.rs b/shared-lib/lib-ot/src/rich_text/builder.rs
index 84f3f09cfe..cc0a4e4370 100644
--- a/shared-lib/lib-ot/src/rich_text/builder.rs
+++ b/shared-lib/lib-ot/src/rich_text/builder.rs
@@ -1,15 +1,15 @@
 #![allow(non_snake_case)]
 #![allow(clippy::derivable_impls)]
-use crate::rich_text::{RichTextAttribute, RichTextAttributes};
+use crate::rich_text::{TextAttribute, TextAttributes};
 
 pub struct AttributeBuilder {
-    inner: RichTextAttributes,
+    inner: TextAttributes,
 }
 
 impl std::default::Default for AttributeBuilder {
     fn default() -> Self {
         Self {
-            inner: RichTextAttributes::default(),
+            inner: TextAttributes::default(),
         }
     }
 }
@@ -19,12 +19,12 @@ impl AttributeBuilder {
         AttributeBuilder::default()
     }
 
-    pub fn add_attr(mut self, attribute: RichTextAttribute) -> Self {
+    pub fn add_attr(mut self, attribute: TextAttribute) -> Self {
         self.inner.add(attribute);
         self
     }
 
-    pub fn build(self) -> RichTextAttributes {
+    pub fn build(self) -> TextAttributes {
         self.inner
     }
 }
diff --git a/shared-lib/lib-ot/src/rich_text/delta.rs b/shared-lib/lib-ot/src/rich_text/delta.rs
index 3a60cf7b02..f00d29e72a 100644
--- a/shared-lib/lib-ot/src/rich_text/delta.rs
+++ b/shared-lib/lib-ot/src/rich_text/delta.rs
@@ -1,5 +1,5 @@
 use crate::core::{Delta, DeltaBuilder};
-use crate::rich_text::RichTextAttributes;
+use crate::rich_text::TextAttributes;
 
-pub type RichTextDelta = Delta<RichTextAttributes>;
-pub type RichTextDeltaBuilder = DeltaBuilder<RichTextAttributes>;
+pub type RichTextDelta = Delta<TextAttributes>;
+pub type RichTextDeltaBuilder = DeltaBuilder<TextAttributes>;
diff --git a/shared-lib/lib-ot/src/rich_text/macros.rs b/shared-lib/lib-ot/src/rich_text/macros.rs
index 28fe903183..c8c396427d 100644
--- a/shared-lib/lib-ot/src/rich_text/macros.rs
+++ b/shared-lib/lib-ot/src/rich_text/macros.rs
@@ -6,7 +6,7 @@ macro_rules! inline_attribute {
     ) => {
         pub fn $key(value: $value) -> Self {
             Self {
-                key: RichTextAttributeKey::$key,
+                key: TextAttributeKey::$key,
                 value: value.into(),
                 scope: AttributeScope::Inline,
             }
@@ -22,7 +22,7 @@ macro_rules! block_attribute {
     ) => {
         pub fn $key(value: $value) -> Self {
             Self {
-                key: RichTextAttributeKey::$key,
+                key: TextAttributeKey::$key,
                 value: value.into(),
                 scope: AttributeScope::Block,
             }
@@ -41,7 +41,7 @@ macro_rules! list_attribute {
                 true => $value,
                 false => "",
             };
-            RichTextAttribute::List(value)
+            TextAttribute::List(value)
         }
     };
 }
@@ -54,7 +54,7 @@ macro_rules! ignore_attribute {
     ) => {
         pub fn $key(value: $value) -> Self {
             Self {
-                key: RichTextAttributeKey::$key,
+                key: TextAttributeKey::$key,
                 value: value.into(),
                 scope: AttributeScope::Ignore,
             }
diff --git a/shared-lib/lib-ot/tests/node/script.rs b/shared-lib/lib-ot/tests/node/script.rs
index 34daca8d7c..c263a1330c 100644
--- a/shared-lib/lib-ot/tests/node/script.rs
+++ b/shared-lib/lib-ot/tests/node/script.rs
@@ -1,21 +1,21 @@
-use lib_ot::core::{DocumentTree, NodeAttributes, NodeSubTree, Path, TransactionBuilder};
+use lib_ot::core::{Node, NodeAttributes, NodeTree, Path, TransactionBuilder};
 
 pub enum NodeScript {
-    InsertNode { path: Path, node: NodeSubTree },
+    InsertNode { path: Path, node: Node },
     InsertAttributes { path: Path, attributes: NodeAttributes },
     DeleteNode { path: Path },
     AssertNumberOfChildrenAtPath { path: Option<Path>, len: usize },
-    AssertNode { path: Path, expected: Option<NodeSubTree> },
+    AssertNode { path: Path, expected: Option<Node> },
 }
 
 pub struct NodeTest {
-    node_tree: DocumentTree,
+    node_tree: NodeTree,
 }
 
 impl NodeTest {
     pub fn new() -> Self {
         Self {
-            node_tree: DocumentTree::new(),
+            node_tree: NodeTree::new(),
         }
     }
 
@@ -36,7 +36,7 @@ impl NodeTest {
             }
             NodeScript::InsertAttributes { path, attributes } => {
                 let transaction = TransactionBuilder::new(&self.node_tree)
-                    .update_attributes_at_path(&path, attributes.to_inner())
+                    .update_attributes_at_path(&path, attributes)
                     .finalize();
                 self.node_tree.apply(transaction).unwrap();
             }
@@ -53,7 +53,7 @@ impl NodeTest {
                     None => assert!(node_id.is_none()),
                     Some(node_id) => {
                         let node_data = self.node_tree.get_node_data(node_id).cloned();
-                        assert_eq!(node_data, expected.and_then(|e| Some(e.to_node_data())));
+                        assert_eq!(node_data, expected.and_then(|e| Some(e.into())));
                     }
                 }
             }
diff --git a/shared-lib/lib-ot/tests/node/test.rs b/shared-lib/lib-ot/tests/node/test.rs
index d299b08714..aa15ff76a5 100644
--- a/shared-lib/lib-ot/tests/node/test.rs
+++ b/shared-lib/lib-ot/tests/node/test.rs
@@ -1,11 +1,11 @@
 use crate::node::script::NodeScript::*;
 use crate::node::script::NodeTest;
-use lib_ot::core::{NodeAttributes, NodeSubTree, Path};
+use lib_ot::core::{Node, NodeAttributes, Path};
 
 #[test]
 fn node_insert_test() {
     let mut test = NodeTest::new();
-    let inserted_node = NodeSubTree::new("text");
+    let inserted_node = Node::new("text");
     let path: Path = 0.into();
     let scripts = vec![
         InsertNode {
@@ -23,11 +23,11 @@ fn node_insert_test() {
 #[test]
 fn node_insert_node_with_children_test() {
     let mut test = NodeTest::new();
-    let inserted_node = NodeSubTree {
+    let inserted_node = Node {
         note_type: "text".into(),
         attributes: NodeAttributes::new(),
         delta: None,
-        children: vec![NodeSubTree::new("image")],
+        children: vec![Node::new("image")],
     };
     let path: Path = 0.into();
     let scripts = vec![
@@ -47,13 +47,13 @@ fn node_insert_node_with_children_test() {
 fn node_insert_multi_nodes_test() {
     let mut test = NodeTest::new();
     let path_1: Path = 0.into();
-    let node_1 = NodeSubTree::new("text_1");
+    let node_1 = Node::new("text_1");
 
     let path_2: Path = 1.into();
-    let node_2 = NodeSubTree::new("text_2");
+    let node_2 = Node::new("text_2");
 
     let path_3: Path = 2.into();
-    let node_3 = NodeSubTree::new("text_3");
+    let node_3 = Node::new("text_3");
 
     let scripts = vec![
         InsertNode {
@@ -88,14 +88,14 @@ fn node_insert_multi_nodes_test() {
 fn node_insert_node_in_ordered_nodes_test() {
     let mut test = NodeTest::new();
     let path_1: Path = 0.into();
-    let node_1 = NodeSubTree::new("text_1");
+    let node_1 = Node::new("text_1");
 
     let path_2: Path = 1.into();
-    let node_2_1 = NodeSubTree::new("text_2_1");
-    let node_2_2 = NodeSubTree::new("text_2_2");
+    let node_2_1 = Node::new("text_2_1");
+    let node_2_2 = Node::new("text_2_2");
 
     let path_3: Path = 2.into();
-    let node_3 = NodeSubTree::new("text_3");
+    let node_3 = Node::new("text_3");
 
     let path_4: Path = 3.into();
 
@@ -143,11 +143,9 @@ fn node_insert_node_in_ordered_nodes_test() {
 fn node_insert_with_attributes_test() {
     let mut test = NodeTest::new();
     let path: Path = 0.into();
-    let mut inserted_node = NodeSubTree::new("text");
-    inserted_node.attributes.insert("bold".to_string(), Some("true".into()));
-    inserted_node
-        .attributes
-        .insert("underline".to_string(), Some("true".into()));
+    let mut inserted_node = Node::new("text");
+    inserted_node.attributes.insert("bold", true);
+    inserted_node.attributes.insert("underline", true);
 
     let scripts = vec![
         InsertNode {
@@ -169,7 +167,7 @@ fn node_insert_with_attributes_test() {
 #[test]
 fn node_delete_test() {
     let mut test = NodeTest::new();
-    let inserted_node = NodeSubTree::new("text");
+    let inserted_node = Node::new("text");
 
     let path: Path = 0.into();
     let scripts = vec![