XFS 3.x from release 2.00 (CWA 13449, 1998) to 3.50 (CWA 16926, 2022), and XFS4IoT from Release 2021-01 to the 2026-04 preview. Commands, events, fields and documentation are cross-referenced across editions, and each item links to the page of the CEN document it was read from.
Reading needs an account with a confirmed email address. What an account can open is set per account.
Seventeen device classes — PTR, IDC, CDM, PIN, CIM, SIU and the rest — plus the API part, with their commands, events, input and output structures, error codes and header definitions, for 2.00, 3.00, 3.10, 3.20, 3.30, 3.40 and 3.50, plus the 3.02 and 3.03 PIN releases. The documentation and background chapters are there too, not just the API tables.
Pick a command or a field and follow it through the editions: when it was added, when a sentence was reworded, when a paragraph disappeared and came back. A lane map shows the whole document release by release; the reader shows the exact words that changed, side by side.
Release 2021-01, 2023-02, 2024-03 and the 2026-04 preview: interfaces, commands, events and their properties, compared across releases. Compose a message and validate it against the schema of the release you target.
Each XFS 3.x item opens the CWA page it was read from, with the passage highlighted. Each XFS4IoT item links to its section of the specification. Where the explorer and the document differ, the document is right, and the link lets you check.
The same data is served to AI assistants and editors over the Model Context Protocol:
/api/xfs3/mcp and /api/xfs4iot/mcp. Tools to list releases, interfaces and
messages, read a message or a field, search the specification, compare two releases, validate a
message and open the source section. Read-only, with a personal token you mint in the app; works
with Claude, Copilot, Cursor and anything else that speaks MCP.
Sign-up asks for an email address and confirms it with a link; temporary mailboxes are not accepted. The address is used for the confirmation link and for notices about changes to the explorer, nothing else.