Re: [xacml] QName questions

[Simon Godik <simon@godik.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?

By looking at the sax api it does not seem that anything is done with
attribute values of qname type.
My guess is that an application is responsible for expanding qname. Problem
is that expanded name
is a pair: (URI, local_name) and there is no standard that says how this 2
elements should be combined to
form one value. Some suggest URI+local_name, others URIlocal_name, and so
on.

My preference would be not to use qnames for attribute values at all, and
use URI's instead.

Simon

----- Original Message -----
From: "Anne Anderson" <Anne.Anderson@Sun.com>
To: "XACML TC" <xacml@lists.oasis-open.org>
Sent: Friday, October 25, 2002 8:47 AM
Subject: [xacml] QName questions


> 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
>
>
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