[DDI-users] DDI 3.0 xsd question

[Wendy Thomas]

This is the place...on a conference call more later :)  wlt

On Thu, 5 Feb 2009, Alerk Amin wrote:

> Hello,
>
>   I have a question about a DDI 3.0 document that I am trying to
> validate.  I hope this is the right mailing list for this question: if
> it is not, please let me know where I should mail this question.
>   The following snippet of XML validates properly, but it seems to me
> like it should not:
>
> <l:ConceptReference>
> 	<r:ID>C_1</r:ID>
> 	<r:ID>C_2</r:ID>
> </l:ConceptReference>
>
>   Based on the documentation of the ReferenceType in reusable.xsd, the
> Reference should have a URN, an ID, or both.  2 IDs (or 2 URNs) should
> not be allowed.
>   In reusable.xsd, the schema for the ReferenceType contains:
>
>       <xs:choice maxOccurs="2">
>         <xs:element ref="URN">
>           ...
>         </xs:element>
>         <xs:sequence>
>           <xs:element ref="ID">
>             ...
>           </xs:element>
>           ...
>         </xs:sequence>
>       </xs:choice>
>
> In order to validate the way the documentation describes, it seems like
> the scheme should instead contain:
>
>     <xs:choice>
>       <xs:sequence>
>         <xs:element ref="URN">
>           ...
>         </xs:element>
>         <xs:sequence minOccurs="0">
>           <xs:element ref="ID">
>             ...
>           </xs:element>
>           ...
>         </xs:sequence>
>       </xs:sequence>
>       <xs:sequence>
>         <xs:sequence>
>           <xs:element ref="ID">
>             ...
>           </xs:element>
>           ...
>         </xs:sequence>
>         <xs:element ref="URN" minOccurs="0">
>           ...
>         </xs:element>
>       </xs:sequence>
>     </xs:choice>
>
> I would appreciate any help or explanation anyone can provide about
> this.  If my interpretation of the ReferenceType is incorrect, please
> let me know.
>   Thank you for your help.
>
> Best,
> Alerk
>
> -- 
> Alerk Amin
> Senior Software Developer
> CentERdata
> Room K737 (Tilburg University, Koopmans Building)
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Wendy L. Thomas                          Phone: +1 612.624.4389
Data Access Core Director		 Fax:   +1 612.626.8375
Minnesota Population Center              Email: wlt at pop.umn.edu
University of Minnesota
50 Willey Hall
225 19th Avenue South
Minneapolis, MN 55455