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XSD for the following XML

Posted on 2011-10-18
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Last Modified: 2012-05-12
<Metadata>
       <Data_tag  Name="Actors" Value="Van"  />
       <Data_tag Name="Category" Value="Drama"  />
       <Data_tag  Name="Actors" Value="Adkins"  />
       <Data_tag  Name="Actors" Value="Higgs"  />          
       <Data_tag Name="Category" Value="Action"  />
</Metadata>

Name could be Actors or Category.When "Name=Category", Value could be Drama or Action or Comedy.

There is no set order in which these Data_tags appear. Also, there we need to guarantee there is at least one  data_tag with Name=Actors is present. Also we need guarantee at the most two data_tags wtih Name=Category are present.  

Could we generate a XSD schema ?
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Question by:deluxernd
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by:deluxernd
ID: 36990693
Question edited for clarity
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Geert Bormans earned 2000 total points
ID: 36990803
> east one  data_tag with Name=Actors is present. Also we need guarantee at the most two data_tags wtih Name=Category are present.

This can NOT be modelled in W3C schema 1.0

This is a co-occurence constraint.

You can do this by
- using a schematrone schema (http://www.schematron.com/)
- adding schematron rules (embedded) in your W3C schema. But you need to figure out whether your parser understands schematron embedded rules (a lot of them do)
- use W3C schem 1.1 assertions. But you need a schema parser that accepts 1.1 constructs, very few do yet as 1.1 is not yet a recommendation. Saxon does (www.saxonica.com)
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