[xacml] How do I require subject not to be a member of a given group?

Daniel: This may be a use case for your issue with specifying a
sequence in an AttributeValue.  Could you let me know if this is
the correct way to do it?

Rule in English: Any subject who is not a member of the
"convicted-felons" group may perform any action on any resource.

Rule in  XACML:

    <Rule
          RuleId="identifier:conformance-test:IIC008:rule"
          Effect="Permit">
        <Description>
            Any subject who is not a member of the
            convicted-felons group may perform any action on any
            resource.
        </Description>
        <Target>
            <Subjects>
                <AnySubject/>
            </Subjects>
            <Resources>
                <AnyResource/>
            </Resources>
            <Actions>
                <AnyAction/>
            </Actions>
        </Target>
        <Condition FunctionId="function:integer-equal">
            <Apply FunctionId="function:integer-length">
                <Apply FunctionId="function:string-intersection">
                    <SubjectAttributeDesignator
                          AttributeId="identifier:conformance-test:group"
                          DataType="xacml:sequence-string"/>
                    <AttributeValue
                          DataType="xacml:sequence-string">
                        <AttributeValue
                              DataType="xs:string">convicted-felon</AttributeValue>
                    </AttributeValue>
                </Apply>
            </Apply>
            <AttributeValue
                  DataType="xs:integer">0</AttributeValue>
        </Condition>
    </Rule>



-- 
Anne H. Anderson             Email: 
Sun Microsystems Laboratories
1 Network Drive,UBUR02-311     Tel: 781/442-0928
Burlington, MA 01803-0902 USA  Fax: 781/442-1692