[doc] update README, tag Draft-4

Author: fangq

ChangeLog.txt

@@ -2,6 +2,23 @@
 
 Major updates are marked with a "*"
 
+== JData Spec Draft-4, FangQ <q.fang (a) neu.edu> ==
+
+ 2026-04-08 [a88fca8] [schema] update json schema
+ 2026-04-08 [e0dfdd5] [doc] update header info
+ 2026-04-08 [c8bfe9f] [spellcheck] fix errors in spellcheck ci
+ 2026-04-08 [a800056] spec: extend annotation keywords, array shapes, and fix editorial issues
+ 2026-04-08 [57de727] Update introduction
+ 2026-01-26 [3f5426e] Update .wordlist.txt
+ 2026-01-22 [7f03687] Update JData_specification.md
+ 2025-12-02 [792aa4a] Merge pull request #26 from NeuroJSON/dependabot/github_actions/actions/checkout-6
+ 2025-12-02 [c708fd7] Bump actions/checkout from 5 to 6
+ 2025-08-24 [05c6e04] [schema] add json schema for jdata annotations
+ 2025-08-17 [623807d] Merge pull request #22 from NeuroJSON/dependabot/github_actions/actions/checkout-5
+ 2025-08-12 [0875682] Bump actions/checkout from 4 to 5
+ 2025-03-24 [6c96743] Merge pull request #15 from nebkat/patch-1
+ 2025-03-24 [3ca6ab5] [typo] fix typo
+
 == JData Spec Draft-3, FangQ <q.fang (a) neu.edu> ==
 
  2025-02-22 [8907586] Update .wordlist.txt

NOTICE.txt

@@ -1,5 +1,5 @@
 JData Specification
 
-Copyright (C) 2015,2019-2025 Qianqian Fang <q.fang at neu.edu>
+Copyright (C) 2015,2019-2026 Qianqian Fang <q.fang at neu.edu>
 
 License: Apache License Version 2.0, please see LICENSE_Apache-2.0.txt for details

README.md

@@ -5,13 +5,18 @@
 We use this repository to gather feedback from the community regarding the 
 ["JData Format Specification"](JData_specification.md), or JData format. Such 
 feedback is crucial to finalize this file specification and help improve
-it in the future once disseminated. 
+it in the future once disseminated.
 
 The latest version of the JData specification can be found in the file named 
 [JData_specification.md](JData_specification.md). The specification is written
 in the [Markdown format](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet) 
 for convenient editing and version control.
 
+The version and status of the current draft are indicated in the header of
+[JData_specification.md](JData_specification.md). Frozen releases are published
+at https://neurojson.org/jdata/. A formal JSON Schema for validating JData
+documents is provided in [schema/jdata_format_schema.json](schema/jdata_format_schema.json).
+
 ## What is JData
 
 JData defines a set of **standardized**, **lightweight** and **language-neutral** annotations
@@ -27,8 +32,8 @@ JSON format BJData/UBJSON for smaller file size and faster parsing. These data f
 are JSON/BJData compliant and can be readily read without needing one to write their
 own format. There exist numerous JSON parsers, abundant BJData/UBJSON parsers, and
 extensively developed tools in the large JSON ecosystem - including utilities like
-as `jq`, JSON-native NoSQL databases, and JSON-based standards such as JSON-schema
-for validation, JSON-Reference and JSON-LD for data linking, JSON-Path for query etc.
+`jq`, JSON-native NoSQL databases, and JSON-based standards such as JSON Schema
+for validation, JSON Reference and JSON-LD for data linking, JSONPath for query, etc.
 
 ![](./images/JData_Diagram.png)
 
@@ -48,8 +53,8 @@ draft of this file specification, including
     RFC (Request for comments) commit (where the entire file is removed
     and re-added so that every line appears in such commit). One can
     write short comments as well as post replies on this RFC page. 
-  - The latest RFC commit is based on **Draft 2 (version v0.8)**. Please use
-    [this link](https://github.com/NeuroJSON/jdata/commit/6bb02c8a654938451d686c4a7c2b1b0619e7cf17) to comment.
+  - For feedback on the current version, the [Issues section](https://github.com/NeuroJSON/jdata/issues)
+    is the preferred channel.
   - To add a comment, you need to first register a github account, and then 
     browse the above RFC page. When hovering your cursor over each line, a 
     "plus" icon is displayed, clicking it will allow one to comment on a