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Subject: RE: Use of Xquery with XACML
As I am a member of W3C XQuery working group, I may try to answer. XPath 2.0 and XQuery 1.0 (which are both still not in the last call stage yet) are using the same underlying data model. For most intends and purposes XPath 2.0 is a subset of XQuery, lacking such facilities as full FLWOR expression and element constructors. I seriously doubt that adding those data transformation facilities will add any value to the XACML representation, but will make it much more cumbersome to implement and use. We really refer to data as being evidence - transient result of an XQuery expression does not fit well with this notion. It seems to me that you may achieve the result you want in a much more straightforward way if you use some stand alone XQuery engine, such as SAXON (http://saxon.sourceforge.net/) from Michael Kay, to construct the resource content document. You may then refer to the constructed data using XPath expressions, or populate notional context using those results. Daniel; -----Original Message----- From: Muhammad Masoom Alam [mailto:Muhammad.alam@uibk.ac.at] Sent: Sunday, December 05, 2004 10:47 AM To: Daniel Engovatov; xacml-dev@lists.oasis-open.org Cc: Seth Proctor; sunxacml-discuss@lists.sourceforge.net Subject: Use of Xquery with XACML Dear all, After looking at the restricted use of Xpath in XACML , i propose the use of Xquery , which is much more advanced n have a alots of database SQL like features to query to the XML documents, and it is very feasible to use Xquery instead of Xpath for advance Queries in XML. In this regard , Dear seth , do u have some knwoledge of java libraries about Xquery , so that they can be easily embeded into the SUN's implemenation ?? with Best regards. Muhamamd.
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