<?xml version="1.0" encoding="UTF-8"?>
<Policy/>
against
<?xml version="1.0" encoding="UTF-8"?>
<RequestContext/>
Both structures are valid XML, aren't they? What would a compliant valid
PDP evaluate this scenario to?
--------------
They are not, not according to this schema:
<xs:element name="Policy" type="xacml:PolicyType"/>
<xs:complexType name="PolicyType">
<xs:sequence>
<xs:element ref="xacml:Description" minOccurs="0"/>
<xs:element ref="xacml:PolicyDefaults"
minOccurs="0"/>
<xs:element ref="xacml:Target"/>
<xs:element ref="xacml:Rule" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="xacml:Obligations" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="PolicyId" type="xs:anyURI"
use="required"/>
<xs:attribute name="RuleCombiningAlgId" type="xs:anyURI"
use="required"/>
</xs:complexType>
In any case it is not the issue of the document validity - but the issue
that the policy exists (and can be "compiled" and accepted independent of
the data context, in the general case.
