Validating IDREFS...

Marcus Carr mrc at
Tue Sep 1 02:32:23 BST 1998

Attila Torcsvari wrote:

> Recently I wanted to make more checkable my SGML/XML source,
> and I have similar troubles mentioned on this thread.
> What should I do if my IDs and IDREFs contain non-name characters? Why is it so?!
> (My pages should be reachable for external databases, which use identifiers with the same syntax, so I can not just convert the values to something else.)

With SGML it's easy - you just need to extend the SGML declaration to allow the characters to be valid name characters. With XML, the only thing I can think
of off hand is to define the attributes as CDATA rather than ID/IDREF and write something to check that the values match up, possibly as a post process.
ID/IDREF processing can't be resolved until the end of the document has been reached anyway, so this might not be a huge disadvantage.


Marcus Carr                 email:  mrc at
Allette Systems (Australia) email:  info at
Level 10, 91 York Street    www:
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