[xacml] [schema change] AttributeValue in context schema 18f

<xs:complexType name="AttributeValueType" is defined as
containing a sequence of xs:any with minOccurs="0" and
maxOccurs="unbounded".

AttributeValue is referenced from Attribute.  I thought we had
agreed that there could be only one AttributeValue per Attribute.

I suggest sequence be minOccurs="0" and maxOccurs="1".

Note that minOccurs="0" should be allowed because some attributes
do not have values: the attribute name itself is the attribute
value.

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