Johannes Koch writes:

> R.Schuetze wrote:
>> I'm working on an XSD schema for an 3D Point. The XML struktur of the
>> point is the following:
>>           <Point name="6" target="Retro" type="TP" unit="m">
>>             <param name="X" value="0.000"/>
>>             <param name="Y" value="0.000"/>
>>             <param name="Z" value="0.000"/>
>>           </Point>
>
> Why not make it
>
> <Point name="6" target="Retro" type="TP" unit="m">
>    <xparam value="0.000"/>
>    <yparam value="0.000"/>
>    <zparam value="0.000"/>
> </Point>
> ?

Something along those lines is certainly the best way to go.

If you R.Schuetze _must_ have the original structure, a verbose
indentity-constraint solution will work -- add the following to the
element declaration for Point

 <xs:keyref refer="dims" name="krx">
  <xs:selector xpath="."/>
  <xs:field xpath="@x"/>
 </xs:keyref>
 <xs:keyref refer="dims" name="kry">
  <xs:selector xpath="."/>
  <xs:field xpath="@y"/>
 </xs:keyref>
 <xs:keyref refer="dims" name="krz">
  <xs:selector xpath="."/>
  <xs:field xpath="@z"/>
 </xs:keyref>
 <xs:key name="dims">
  <xs:selector xpath="param"/>
  <xs:field xpath="@name"/>
 </xs:key>

and add the following to the type defintion used for Point:

   <xs:attribute name="x" fixed="X"/>
   <xs:attribute name="y" fixed="Y"/>
   <xs:attribute name="z" fixed="Z"/>

ht
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 Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
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