How does the Universal Category System define CatID and filenames, which version is published, and how do tools carry UCS data in BWF/iXML?

The UCS site describes UCS as a public-domain initiative and announces version 8.2.1 (January 2024), whose only CatID change corrects WOOD-HANDLE to WOODHndl; the MIT-licensed third-party ucsrename tool (9fa45437) embeds the v8.2 list with 'WOODHandl', builds filenames as CatID_FXName_CreatorID_SourceID_UserData.Extension and rejects underscores in field values. The filename rules come from the tool, not a UCS specification text. Curator qualifications: Rights layering preserved: a public-domain list redistributed inside an MIT repository; the MIT licence covers the tool, while the list's status is as stated by UCS (no formal dedication text read). Official resources live in a Dropbox shell page not readable (producer E6, not retried); BaseHead KB iXML statements (E5) not reinspected. Text and data-file reading only; no tool run. Limitations: Third-party tool as filename-rule source. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

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    {
      "url": "https://universalcategorysystem.com/",
      "note": "universalcategorysystem.com (bytes equal producer pin 4d8cff15); brettbuddin/ucsrename README.md at 9fa45437; renamer/renamer.go lines 183-188; LICENSE; ucs/UCS-v8.2.csv"
    },
    {
      "url": "https://github.com/brettbuddin/ucsrename/tree/9fa454378d50076edc67370ce56f60b3bbf9c43a",
      "note": "universalcategorysystem.com (bytes equal producer pin 4d8cff15); brettbuddin/ucsrename README.md at 9fa45437; renamer/renamer.go lines 183-188; LICENSE; ucs/UCS-v8.2.csv"
    },
    {
      "url": "https://baseheadinc.com/kb/ucs-categories/",
      "note": "universalcategorysystem.com (bytes equal producer pin 4d8cff15); brettbuddin/ucsrename README.md at 9fa45437; renamer/renamer.go lines 183-188; LICENSE; ucs/UCS-v8.2.csv"
    }
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