Issue: glossary.dtd does not conform to 1.2 spec filenaming rules

Eliot, you are correct.

I should have said that it is a good practice to use different file
names for different shells. Using unique names reduces the chance of
confusion, it allows different people or different organizations to
organize their DITA files differently without creating conflicts, and it
allows the DITA TC to organize things differently from release to
release without having to worry about name conflicts.

-Jeff

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