Problem with scope of <unique> in .NET XML schema classes?

["Ola Strandberg" <strandberg_ola@hotmail.com>]

Hi All,
I have a schema that contains the following:

<!-- definition of the price element in the "ind" namespace -->
<xs:element name="price">
  <xs:complexType>
    <xs:sequence>
      <xs:group ref="util:auditElems" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:attribute name="type" use="required">
      <xs:simpleType>
        <xs:restriction base="xs:string">
          <xs:enumeration value="pricetype1"/>
          <xs:enumeration value="pricetype2"/>
          <xs:enumeration value="pricetype3"/>
          <xs:enumeration value="pricetype4"/>
        </xs:restriction>
      </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="v" type="xs:decimal" use="optional"/>
  </xs:complexType>
</xs:element>

<!-- in a container element, I have a child called typeofpack,
which in turn may have many presentations. For each presentation,
I want them to have a unique set of prices. -->
<xs:element name="typeofpack">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="presentation" maxOccurs="unbounded">
        <xs:complexType>
          <xs:sequence>
             : more elements snipped
            <xs:element ref="ind:price" minOccurs="0" maxOccurs="4"/>
             : more elements snipped
          </xs:sequence>
        </xs:complexType>
        <xs:unique name="uniqueindprice">
          <xs:selector xpath="ind:price"/>
          <xs:field xpath="@type"/>
        </xs:unique>
            : more unique constraints snipped
      </xs:element>
    </xs:sequence>
  </xs:complexType>
</xs:element>

Now, in XMLSPY, this works as expected regardless of the number of 
presentation elements. As long as there are only one of each ind:price/@type 
occurences it works.

The problem arises when I validate this with an XMLValidatingReader from the 
.NET framework. It seems that it disregards the scope of the unique 
constraint (which should be *within* each presentation element) and 
complains when there are occurences of the same ind:price/@type across the 
*whole document*.

"There is a duplicate key sequence 'pricetype1' for '<urn>:uniqueindprice' 
key or unique identity constraint.  An error occurred at 
file:///<path>/test.xml(715, 7)"

Any ideas?

Cheers,
Ola Strandberg, Cut! Consulting




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