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Re: Composite constraints

• To: xml-dev@l...
• Subject: Re: Composite constraints
• From: "Rick Jelliffe" <ricko@a...>
• Date: Mon, 7 Mar 2005 17:26:50 +1100 (EST)
• Importance: Normal
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>> In XML Schema is it possible to express a constraint such as
>> "field1.maxLength + field2.maxLength must not exceed 50 characters"
>> without constraining any one field to less than 50 characters on it's
>> own?
>
> No. Use Schematron for that.


Actually, there is a workaround.

When serializing the data into XML, generate a third element/attribute
containing field1 and field2 concatenated, and constrain that to < 50
characters in the schema. Throw this element or attribute away after
validation, by some custom magic.

Cheers
Rick Jelliffe

• References:
  • Composite constraints
    • From: Charles Woerner <cwoerner@e...>
  • Re: Composite constraints
    • From: "Rick Jelliffe" <ricko@a...>

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