another naieve question - valid characters for ID values

[Rick Jones <rick_jones2@hp.com>]

So, at the risk of stumbling across another point of contention between
programmers and writers :)

Why do the the values of an ID attribute have to start with something
besides a number? That is to say, why can't they be simply numbers? Or
have I encountered a limitation of the parser I'm using (libxml2)?

rick jones
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