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Can XML Schema represent this?

From: sburr@--------.--- (------ ----)
To: NULL
Date: 6/2/2004 6:24:00 AM

I would like to restrict the values of an attribute to boolean
expressions combining enumerated values. Is this possible?

An example instance document might look something like:

  <myElement expression="apples OR oranges"/>

I thought I'd start with something like:

  <xs:element name="myElement" type="myElementType"/>

  <xs:complexType name="myElementType">
    <xs:attribute name="expression" type="myAttributeType"/>
  </xs:complexType>

  <xs:simpleType name="myAttributeValues">
    <xs:restriction base="xs:string">
      <xs:enumeration value="apples"/>
      <xs:enumeration value="oranges"/>
      <xs:enumeration value="bananas"/>
      <xs:enumeration value="pears"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="myAttributeType">
    <xs:restriction base="myAttributeValues">

      <!-- WHAT GOES HERE TO ALLOW BOOLEAN EXPRESSIONS
           OF THE ENUMERATED TYPE VALUES? -->

    </xs:restriction>
  </xs:simpleType>

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Can XML Schema represent this?