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4 changes: 4 additions & 0 deletions spec.txt
Original file line number Diff line number Diff line change
Expand Up @@ -8914,6 +8914,10 @@ so custom tags (and even, say, DocBook tags) may be used.

Here is the grammar for tags:

An optional [namespace](@) consists of an ASCII letter
followed by zero or more ASCII letters, digits, or
hyphens (`-`), ending with a colon (`:`).

A [tag name](@) consists of an ASCII letter
followed by zero or more ASCII letters, digits, or
hyphens (`-`).
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