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Re: [xml-dev] Why cant xml:id be numeric only ?

On 29/04/2011 15:22, David Lee wrote:
000001cc0678$eb8277a0$c28766e0$@calldei.com" type="cite">

First off I know asking "Why" for anything standards related is silly.


But given that, could anyone give me a rationale or history for restricting xml:id (or the ID type from DTD) to be NCName which then has to start with non-numeric ?

I seem to recall asking this once, and being told that the history lay in the SGML rules for abbreviated syntax. Something like allowing <e id="xyz"/> to be abbreviated as <e xyz>. Not that this in itself would make a numeric identifier ambiguous, but it would account for requiring an ID value to have the same syntax as an attribute name.

I guess another justification is that it prevents any debate about whether xml:id="01234" is a duplicate of xml:id="1234".

Michael Kay

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