[xacml] [CR#0143][text, schema change] 6.15 status detail formats:missing-attribute

In response to my action item to provide missing-attribute
StatusDetail schema fragment for the context schema, here is my proposal:

  <xs:element name="MissingAttributeStatusDetail"
              type="xacml-context:MissingAttributeStatusDetailType"/>
  <xs:complexType name="MissingAttributeStatusDetailType">
    <xs:sequence>
      <xs:choice>
        <xs:element ref="xacml:CategorizedSubjectAttributeDesignator"/>
        <xs:element ref="xacml:SubjectAttributeDesignator"/>
        <xs:element ref="xacml:QualifiedSubjectAttributeDesignator"/>
        <xs:element ref="xacml:ResourceAttributeDesignator"/>
        <xs:element ref="xacml:ActionAttributeDesignator"/>
        <xs:element ref="xacml:EnvironmentAttributeDesignator"/>
        <xs:element ref="xacml:AttributeSelector"/y>
      </xs:choice>
      <xs:element ref="xacml-context:AttributeValue" minOccurs="0"/>
  </xs:complexType>

Note that StatusDetail is defined to take a sequence of xs:any
with minOccurs="0" and maxOccurs="unbounded".  So if the PDP
wants to return information about more than one missing
attribute, it can use a StatusDetail element containing multiple
instances of the above schema fragment.

I use the xacml-context definition of AttributeValue because it
does not include DataType.  If we use the xacml-policy
definition, then DataType will be specified in both the
AttributeDesignator/Selector AND in the AttributeValue.

Anne
-- 
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