RE: XML valued datatypes

Martin,
 
Querying XML documents is a much bigger deal than inventing an optional operator. There is a whole working group for XML query. Please review what they have done.
 
Alan Babich

	-----Original Message-----
	From: Wallmer, Martin [mailto:Martin.Wallmer@softwareag.com] 
	Sent: Tuesday, October 07, 2003 3:29 AM
	To: 'Julian Reschke'; Wallmer, Martin; www-webdav-dasl@w3.org
	Subject: RE: XML valued datatypes
	
	
	So lets make it an optional operator
	 
	Regards,
	Martin

		-----Original Message-----
		From: Julian Reschke [mailto:julian.reschke@gmx.de]
		Sent: Dienstag, 7. Oktober 2003 11:48
		To: Wallmer, Martin; www-webdav-dasl@w3.org
		Subject: RE: XML valued datatypes
		
		
		Martin,
		 
		the simple answer is that DAV:basicsearch doesn't support queries on properties that do not have a text content model. See http://greenbytes.de/tech/webdav/draft-reschke-webdav-search-latest.html#non-simple-types. So a server MUST NOT attempt to match in this case.
		 
		So yes, a new operator that does XPath-based matching on a property value may make a lot of sense, but of course it can't become a required operator for DAV:basicsearch.
		 
		Julian
		 
		 

		--
		<green/>bytes GmbH -- http://www.greenbytes.de <http://www.greenbytes.de/>  -- tel:+492512807760 

			-----Original Message-----
			From: www-webdav-dasl-request@w3.org [mailto:www-webdav-dasl-request@w3.org]On Behalf Of Wallmer, Martin
			Sent: Tuesday, October 07, 2003 11:20 AM
			To: www-webdav-dasl@w3.org
			Subject: XML valued datatypes
			
			

			Hi, 

			when we're talking about datatypes, what about xml value'd properties? 

			Example: 

			You have two resources, one you PROPPATCHed with: 

			<?xml version="1.0" encoding="utf-8"?> 
			<D:propertyupdate xmlns:D="DAV:"> 
			  <D:set> 
			    <D:prop xmlns:Z="http://www.w3.com/standards/z39.50"> 
			      <Z:authors> 
			        <Z:Author>Jim Whitehead</Z:Author> 
			        <Z:Author>Roy Fielding</Z:Author> 
			        <Z:Co-author>Lieschen Mueller</Z:Co-author> 
			      </Z:authors> 
			    </D:prop> 
			  </D:set> 
			</D:propertyupdate> 

			the second with 

			<?xml version="1.0" encoding="utf-8"?> 
			<D:propertyupdate xmlns:D="DAV:"> 
			  <D:set> 
			    <D:prop xmlns:Z="http://www.w3.com/standards/z39.50"> 
			      <Z:authors> 
			        <Z:Author>Lieschen Mueller</Z:Author> 
			      </Z:authors> 
			    </D:prop> 
			  </D:set> 
			</D:propertyupdate> 

			How to find all resources, where Lieschen Mueller was author, not Co-author? Currently you have to define something like:

			<like> 
			  <prop> 
			    <Z:authors/> 
			  </prop> 
			  <literal>%Lieschen Mueller%</literal> 
			</like> 

			but of course you will find both resources. Relying on formatting won't work. So what about something like: 

			<xpath> 
			  <prop> 
			    <Z:authors/> 
			  </prop> 
			  <literal>[Z:author="Lieschen Mueller"]</literal> 
			</xpath> 

			or finding all resources, where a Co-author is defined: 

			<xpath-is-defined> 
			  <prop> 
			    <Z:authors/> 
			  </prop> 
			  <literal>./Z:Co-author</literal> 
			</xpath-is-defined> 

			where the literal is an xpath expression relative to the property (root element). 

			Regards, 
			Martin 

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