[xacml-comment] E001, E002

Both PolicySetId1 policies contain rules with the following fragment. It 
should
use only-one-of to convert the bags into primitives...

                <Apply 
FunctionId="urn:oasis:names:tc:xacml:1.0:function:integer-subtract">
                    <SubjectAttributeDesignator
                          
AttributeId="urn:oasis:names:tc:xacml:1.0:conformance-test:age"
                          
DataType="http://www.w3.org/2001/XMLSchema#integer"/>
                    <EnvironmentAttributeDesignator
                          
AttributeId="urn:oasis:names:tc:xacml:1.0:conformance-test:bart-simpson-age"
                          
DataType="http://www.w3.org/2001/XMLSchema#integer"/>
                </Apply>