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tags: add text to distinguish IANA assigned tag names and all the others #1076

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robUx4 merged 1 commit into from
Feb 27, 2026
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tags: add text to distinguish IANA assigned tag names and all the others #1076

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2 changes: 2 additions & 0 deletions cellar-tags/tagging.md
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Expand Up @@ -74,6 +74,8 @@ which tag has the desired meaning so that other apps could understand the same m

### TagName Formatting

The `TagName` element can hold any UTF-8 data. However, to distinguish between the IANA assigned names and custom or private ones, a set of rules are defined.

Assigned `TagName` values **MUST** consist of latin capital letters, numbers and the underscore character '_'.

Assigned `TagName` values **MUST NOT** contain any space.
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