[xacml] QName questions

[Anne Anderson <Anne.Anderson@Sun.com>]

1. If an xml attribute is defined as Type="xs:QName", then do XML
   parsers like SAX and DOM do the resolution of those names?

   Example: Assume AttributeDesignatorType is defined as follows:
	<xs:complexType name="AttributeDesignatorType">
		<xs:attribute name="AttributeId" type="xs:QName" use="required"/>
		<xs:attribute name="DataType" type="xs:anyURI" use="required"/>
		<xs:attribute name="Issuer" type="xs:anyURI" use="optional"/>
	</xs:complexType>

   Then, if my Policy says
   <Policy xmlns="urn:oasis:names:tc:xacml:1.0:policy"
           xmlns:sun-attrs="urn:sun:names:attribute-ids"
     ...
     <SubjectAttributeDesignator AttributeId="sun-attrs:attr1"
                  .../>

   And a Request says
   <Request xmlns="urn:oasis:names:tc:xacml:1.0:context"
            xmlns:sun-stuff="urn:sun:names:attribute-ids"
     ...
     <Subject>
        <Attribute  AttributeId="sun-stuff:attr1">
        ...

   Will the tools themselves resolve these, or do I have to
   expand the names and then perform a string match myself?

2. Does anyone have a reference from W3C on whether QNames MAY be
   used as "aliases" for any URI or whether they are ONLY for use
   in referring to URI's that represent schemas?

   I.e. are the uses of QNames for use in identifiers as in #1
   and in our current schemas even allowed (or recommended)?

3. Is there a way to define aliases for shortcut names other than
   QNames?  I.e. can I define an alias to be equal to some
   initial prefix of a long URI, and then have that expanded by
   XML parsing tools?

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