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Empty attributes

From: Olivier Lefevre <lefevrol@-----.--->
To: xmlschema-dev@--.---
Date: 10/19/2005 5:06:00 AM

any DTD-focused newsgroup or mailing list.

I have an XML file in which some attributes are set to
"", e.g., <entry id="4" type=""> and cannot find any
way to allow this in the DTD. The DTD specifies a list
of possible values for type and if I try to add "" to
the list, e.g., by writing <!ENTITY % type "(foo|bar|)">,
the parser complains that "the name token is required in
the enumerated type list for the "type" attribute
declaration.". Similarly if I try to make the attribute
implied rather than required I still get the error that
"" is not a valid value for the type attribute (I naively
thought that an empty attribute might be equated to a
missing one). So I am really stumped. Are empty attributes
possible at all?

FWIW the parser used is XOM, which uses Xerces2 underneath.



From mike@s... Wed Oct 19 08:24:25 2005
Received: from lisa.w

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Empty attributes