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The spec appears to use the EBNF of the XML spec, but nowhere does it say so. Since that particular EBNF grammar has some relatively uncommon components, such as differences and "#xnn" representations of Unicode characters, we should at least reference it. Or define it ourselves, if what we do is not really identical.
This bug duplicates part of bug 5321 and was fixed in the process of rixing that bug, which was fixed in Jan 09 and closed earlier this month. Accordingly, I am marking it fixed, and as originator I will immediately close it.