xml-dev - Re: Schema question (corrected)

[Rick JELLIFFE <ricko@geotempo.com>]

 Brian McAndrews wrote:
 >
 > given the following XML:
 >
 > <Store numberOfProducts=3>
 > <Inventory>
 > <Product>Baseballs</Product>
 > <Product>Footballs</Product>
> <Product>Soccerballs</Product>
 > </Inventory>
 > </Store>
 >
 > Let produce a schema:
 >
 > <xsd:complexType name="Inventory">
 >    <xsd:element name="Product" type="xsd:string"/>
 > </xsd:complexType>
 >
 > My question is, (how) can I specify that the number of "Product" be
equal to
 > the attribute "numberOfProducts" in the Store element?
 
 You can use the Schematron open source schema language, which is
 specifically aimed for the 1001 non-regular constraints that real data
 requires.
 
 Off the top of my head (and correct for prefixes), the appropriate
schema would look something like this:
 
<sch:schema  xmlns:sch="http://www.ascc.net/xml/schematron">
 <sch:pattern>
  <sch:rule context="Inventory[parent::Store]">
     <sch:assert test="parent::*/@numberOfProducts = count(Product)"
     >The of number "Product" elements in an "Inventory" element should
     be equal to the attribute "numberOfProducts" in the Store
     element.</sch:assert>
  </sch:rule>
 </sch:pattern>
</sch:schema>
 
 Schematron home page at
 http://www.ascc.net/xml/resource/schematron/schematron.html
 
Rick Jelliffe

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