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RE: gte vs. numerical property values

From: Wallmer, Martin <Martin.Wallmer@softwareag.com>
Date: Tue, 22 Oct 2002 16:35:02 +0200
Message-ID: <DFF2AC9E3583D511A21F0008C7E6210602D90587@daemsg02.software-ag.de>
To: "'Julian Reschke'" <julian.reschke@gmx.de>, www-webdav-dasl@w3.org

Hi,

good idea to deal with datatypes :-)

some questions
a:)
how the server may happen to have information about the type of a dead
property? 

b:)
what if the server knows about the datatype, and the type in the query does
not match?

Regards,
Martin

-----Original Message-----
From: Julian Reschke [mailto:julian.reschke@gmx.de]
Sent: Dienstag, 22. Oktober 2002 13:47
To: www-webdav-dasl@w3.org
Subject: DAV:gte vs. numerical property values



Hi,

let's consider a dead property "foo", and some resources a, b and c on which
this dead property is defined and has the values "1", "3" and "10".

Consider a DAV:basicsearch with the where clause:

<gte xmlns="DAV:">
  <prop><foo xmlns=""/></prop>
  <literal>3</literal>
</gte>

Which resource will match?

As DAV:basicsearch currently isn't type-aware, the server will have to do a
string comparison, and only the b (with value "3") will match.

Is this really sufficient? It basically means that dead property comparisons
are restricted to strings.

Proposals:

a) If the server happens to have type information for a dead property, it
should try to do a comparison according to the known property type, if the
literal can be parsed into this type. This basically replicates the
behaviour that a client would expect when querying on live properties such
as DAV:getcontentlength, so it could be taken as a simple clarification.

Extended proposal:

b) A client can enforce comparison using a specific data type by specifying
the type in the query, for instance using:

<gte xmlns="DAV:">
  <prop><foo xmlns=""/></prop>
  <literal xsi:type="xs:long">3</literal>
</gte>


Julian


[1]
<http://greenbytes.de/tech/webdav/draft-reschke-webdav-search-latest.html#rf
c.issue.JW16b/JW24a>

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Received on Tuesday, 22 October 2002 10:35:08 GMT

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