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XML Schema Structure for an Enumerated Type with Attributes

I'm trying to create a type in XML Schema to enforce an element with both:

  • One attribute; and
  • Simple content matching the enum.

In an XML document, an element might look like this:

<Operator Permutation="true">
  Equals
</Operator>

Where "Equal" would be one of the enumerations.

Is it possible? If so, how?

I've tried doing in XMLSpy with no success. If I do a simple type, it only allows content enums without attributes. If I do a complex type it only allows attributes without content enums.

Edit: Thanks David. This works fine, but I just added this to the constraint, so the check ignores line breaks:

<xs:whiteSpace value="collapse"/>
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1 answer


What about



  <xs:element name="Operator" type="MixedElement" />

  <xs:complexType name="MixedElement">
    <xs:simpleContent>
      <xs:extension base="EnumType">
        <xs:attribute name="Permutation" type="xs:boolean">
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="EnumType">
    <xs:restriction base="xs:string">
      <xs:enumeration value="Equals"/>
      <xs:enumeration value="NotEquals"/>
    </xs:restriction>
  </xs:simpleType>
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