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RE: XML valued datatypes

From: Julian Reschke <julian.reschke@gmx.de>
Date: Tue, 7 Oct 2003 11:47:34 +0200
To: "Wallmer, Martin" <Martin.Wallmer@softwareag.com>, <www-webdav-dasl@w3.org>
Message-ID: <JIEGINCHMLABHJBIGKBCIENBILAA.julian.reschke@gmx.de>
XML valued datatypesMartin,

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 -- 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

  __________________________
  Martin Wallmer
  Research & Development
  Software AG    ++49 6151 92 1831
  Uhlandstr. 12
  D 64297 Darmstadt
Received on Tuesday, 7 October 2003 05:47:39 GMT

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