Defining an attribute with restrictions in XML schema

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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.

XML

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

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

Please help before I go mad.

Kind wishes, Patrick

Posted 13-Oct-11 23:42pm

Patrick Skelton

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2 solutions

Solution 2

That's brilliant! Thank you.

- Patrick

Posted 14-Oct-11 8:16am

Patrick Skelton

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Reiss · Accepted Answer · 2011-10-14T03:16:00

This should help you on your way

HTML

<xs:schema id="Alpha" xmlns:xs="#unknown">
    targetNamespace="http://tempuri.org/Alpha.xsd"
    elementFormDefault="qualified"
    xmlns="http://tempuri.org/Alpha.xsd"
    xmlns:mstns="http://tempuri.org/Alpha.xsd"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
>
  <xs:element name="Artwork">
    <xs:complextype>
      <xs:attribute name="ID" type="ArtworkType" />
    </xs:complextype>
  </xs:element>

  <xs:simpletype name="ArtworkType">
    <xs:restriction base="xs:integer">
      <xs:mininclusive value="0" />
      <xs:maxinclusive value="100" />
    </xs:restriction>
  </xs:simpletype>
</xs:schema>