• To: 'Thomas Solbjør' <thomas.solbjor@s...>,<xml-dev@l...>
• Subject: RE: element versioning
• From: "Michael Kay" <michael.h.kay@n...>
• Date: Thu, 29 Jul 2004 13:56:51 +0100
• In-reply-to: <20040729082811.TUFI19717.amsfep15-int.chello.nl@TST40>
• Thread-index: AcR1Rd4YvyuY8GaJTWeQuWC77zfjEQAJXIWA

> 
> Is it possible to track versions of elements in schemas?
> 
> I've tried to add two attributes, ID (xsd:ID) and version
> (xsd:positiveInteger), but then the instance won't validate 
> when I add two
> elements with the same ID.
> 

xsd:ID values have to be unique within a document. If you want a more
elaborate constraint (combination of ID and version being unique) you can do
it with an xs:unique constraint in the schema.

Michael Kay

• References:
  • element versioning
    • From: Thomas Solbjør <thomas.solbjor@s...>

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