Schema - How to ensure that attributes are different?

hammie

Hi all,

I'm utterless clueless on how I can go about declaring in my schema that two attributes must contain different values, e.g.

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<mail to="" from="">Text</mail>

How do I set the restriction in the schema that the "to" attribute and "from" attribute must contain different values? Hence 'to="Amy" from="Bob"' will validate, while 'to="Amy" from="Amy"' will fail the validation?

Hope to hear from this community soon. Thanks!

jkmyoung

Unfortunately, I do not know of any way to do this using just xml schema. Are you allowed to use other validation tools such as RelaxNG or SchemaTron?

hammie

Sorry, I'm limited to using W3C - unless I break with the standard (in my project team, that is) and use a different schema type *plus* rebuild the schema for the rest of the XML.. Which is pretty long, so I'm hoping that there's a W3C-schema-solution somewhere out there!

Out of curiosity, how would I restrict the attribute values as mentioned in RelaxNG/SchemaTron? Thanks!

jkmyoung

Not quite an expert in schematron, but it'd be something like:

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<pattern name="Unique atribute"> 

  <rule context="mail"> 

    <assert test="@to != @from">Sender and recipient are the same.</assert>

Schema - How to ensure that attributes are different?

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