Hi Paul,

You can do that with something like:

<xs:annotation>
   <xs:appinfo>
     <sch:pattern name="Check references.">
       <sch:rule context="F">
         <sch:assert 
test="count(G)=../../D[@name=current()/@ref]/@num">Number of G elements 
should match the refered D num
           attribute value.</sch:assert>
       </sch:rule>
     </sch:pattern>
   </xs:appinfo>
</xs:annotation>

A possible complete schema (generated with Trang from the instance 
document and annotated with Schematron) can look like:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
elementFormDefault="qualified"
   xmlns:sch="http://www.ascc.net/xml/schematron">
   <xs:annotation>
     <xs:appinfo>
       <sch:title>Test schematron schema</sch:title>
     </xs:appinfo>
   </xs:annotation>
   <xs:element name="A">
     <xs:complexType>
       <xs:sequence>
         <xs:element ref="B"/>
         <xs:element ref="C"/>
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="B">
     <xs:complexType/>
   </xs:element>
   <xs:element name="C">
     <xs:complexType>
       <xs:sequence>
         <xs:element ref="D"/>
         <xs:element ref="E"/>
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="D">
     <xs:complexType>
       <xs:attribute name="name" use="required" type="xs:NCName"/>
       <xs:attribute name="num" use="required" type="xs:integer"/>
     </xs:complexType>
   </xs:element>
   <xs:element name="E">
     <xs:complexType>
       <xs:sequence>
         <xs:element maxOccurs="unbounded" ref="F"/>
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="F">
     <xs:annotation>
       <xs:appinfo>
         <sch:pattern name="Check references.">
           <sch:rule context="F">
             <sch:assert 
test="count(G)=../../D[@name=current()/@ref]/@num">Number of G elements 
should match the refered D num
               attribute value.</sch:assert>
           </sch:rule>
         </sch:pattern>
       </xs:appinfo>
     </xs:annotation>
     <xs:complexType>
       <xs:sequence>
         <xs:element maxOccurs="unbounded" ref="G"/>
       </xs:sequence>
       <xs:attribute name="name" use="required" type="xs:NCName"/>
       <xs:attribute name="ref" use="required" type="xs:NCName"/>
     </xs:complexType>
   </xs:element>
   <xs:element name="G">
     <xs:complexType/>
   </xs:element>
</xs:schema>

Hope that helps,
George
---------------------------------------------------------------------
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
www.---.com


Paul Popiel wrote:
> Hi,
> 
> If i have a XML stucture like so:
> 
> <A>
>   <B>
>   </B>
>   <C>
>     <D name=test num=3>
>     </D>
>     <E>
>        <F name=one ref=test>
>            <G></G>
>            <G></G>
>            <G></G>
>        </F>
>        <F name=two ref=test>
>            <G></G>
>            <G></G>
>        </F>
> </A>
> 
> 
> how can i write a schematron rule to test that each <F> element has the
> right number of <G> elements in it with respect to the value of the num
> attribute in the <D> element with the same name as that of the <F> elements
> ref attribute.
> 
> so with respect to the above example <F> elements one and two both have ref
> "pointing" to element <D> test, where num=3
> so both <F> elements should have 3 <G> elements
> 
> so in this case <F> two should signal an error when the schematron rule is
> run.
> 
> 
> In terms of the schematron rule:
> 
> 				<sch:pattern name="Correct number of G in
> F.">
> 					<sch:rule context="/">
> 						<sch:assert
> test="????">Incorrect number of G.</sch:assert>
> 					</sch:rule>
> 				</sch:pattern>
> 
> what would be in the test attribute?
> 
> also i would like to work with absolute paths if possible.
> 
> ive tried all sorts of things using //F[count(G) = etc etc but i just cant
> seem to get something working.
> 
> any help would be greatly appreciated
> 
> thanks
> 
> Paul Popiel
> Software Engineer
> 
> Advanced Engine Components Limited
> 14 Energy St, Malaga WA 6090
> Fax: +61 8 9209 6999
> Mob: 0412 657 051
> mailto:paulp@a...
> http://www.advancedengine.com
> 
> 
> 
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