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Well, it's official: I'm thick. I have been programming years, but have never had to define an XML schema before and it is driving me up the wall. Despite looking at tens of examples, I just can't get the syntax right for defining an mandatory attribute on an element with the restriction that the attribute must be a number between 1 and 100.

I can't even get the following simpler example to work, which simply states the attribute must be a positive integer. I get an error saying that MyType2 is not declared or is not a simple type.

<!-- Define a type to hold a single artwork. -->
    <xs:complexType name="ArtworkType">
            <xs:element name="title" type="xs:string"/>
        <xs:attribute name="ID" type="MyType2" use="required"/>

    <!-- Define attributes. -->
    <xs:attribute name="MyType2" type="xs:positiveInteger"/>

Please help before I go mad.

Kind wishes, Patrick

This should help you on your way
<xs:schema id="Alpha" xmlns:xs="#unknown">
  <xs:element name="Artwork">
      <xs:attribute name="ID" type="ArtworkType" />

  <xs:simpletype name="ArtworkType">
    <xs:restriction base="xs:integer">
      <xs:mininclusive value="0" />
      <xs:maxinclusive value="100" />
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That's brilliant! Thank you.

- Patrick
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