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> The rationale here could be that since no other character is following
> the hyphen is not used for indication ranges in character classes, but
> as itself.
This is the correct interpretation I believe.
A single XML character is a ·character range· that identifies the set
of characters containing only itself. All XML characters are valid
character ranges, except as follows:
The - character is a valid character range only at the beginning or
end of a ·positive character group·.
which means that you can (should be able to) use - to mean itself as the
last character in a  group.
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