Hi Chris,
thanks for your reply. I have created an issue for this:
https://issues.apache.org/jira/browse/MUSE-293
regards,
Matthes
2008/9/3 <[EMAIL PROTECTED]>
> Hi Matthes,
>
> You're entirely correct and did not make a mistake, only the namespaces
> from the message itself are used. For my own needs I have extended the
> xpath syntax (new dialect) to use full qnames instead so:
>
> //{
> http://www.opengis.net/om/1.0}:Observation/{http://www.opengis.net/om/1.0}:procedure/@xlink:href='urn:ogc:object:procedure:CITE:WeatherService:LGA<http://www.opengis.net/om/1.0%7D:Observation/%7Bhttp://www.opengis.net/om/1.0%7D:procedure/@xlink:href=%27urn:ogc:object:procedure:CITE:WeatherService:LGA>
> '
>
> becomes
>
> //*[namespace-uri="http://www.opengis.net/om/1.0"; and
> local-name="Observation"]/...
>
> but this decision was also driven from a tooling perspective. Obviously
> its not helpful and I think the standard Muse behaviour is confusing.
>
> Logically we should pass in what the prefixes map to and not just hope they
> are the same as used on the NotificationMessage.
>
> Please raise this as an issue on jira, I may even be able to get a patch
> ready for it today.
>
> cheers,
> Chris
>
> -----Original Message-----
> From: Matthes R. [mailto:[EMAIL PROTECTED]
> Sent: Saturday, August 30, 2008 1:40 PM
> To: [email protected]
> Subject: Problem (Bug?) with XPath filtering
>
> Hello,
>
> I have stumbled across a problem when trying to filter a
> NotificationMessage with an XPath expression containing namespace
> declarations (e.G.
> //om:Observation/om:procedure - where om is "http://www.opengis.net/om/1.0";).
> Perhaps I made some mistake while subscribing with this filter, but to me
> it seems, that the MessagePatternFilter just invokes XPathUtils.isMatch().
> isMatch itself invokes XPathAPI.eval(context, xpath) [from apache xalan
> api] and that method has no parameter for the namespaceNode. This has the
> result that the XPath expression takes its namespaces from the
> NotificationMessage, which of course may differ from the ones specified in
> my subscribe request.
>
> Also I noticed that namespaces in a MessagePatternFilter xml file (see
> below) just get erased when parsing the xml with the FilterFactory.
>
> Filter to parse:
> <wsnt:Filter xmlns:wsnt="http://docs.oasis-open.org/wsn/b-2";>
> <wsnt:MessageContent Dialect="
> http://www.w3.org/TR/1999/REC-xpath-19991116";
> xmlns:om="http://www.opengis.net/om/1.0";>
>
>
> //om:Observation/om:procedure/@xlink:href='urn:ogc:object:procedure:CITE:WeatherService:LGA'
> </wsnt:MessageContent>
> </wsnt:Filter>
>
>
> this gets parsed in the subscribe operation of NotificationProducer (I
> assume this is done before in the FilterFactory):
> <wsnt:Filter xmlns:wsnt="http://docs.oasis-open.org/wsn/b-2";>
> <wsnt:MessageContent Dialect="http://www.w3.org/TR/1999/REC-xpath-19991116
>
> ">//om:Observation/om:procedure/@xlink:href='urn:ogc:object:procedure:CITE:WeatherService:LGA'</wsnt:MessageContent>
> </wsnt:Filter>
>
>
> As you can see the namespace "om:...." is removed.
>
> Did i make a mistake or is there any kind of solution for this problem?
>
> Regards,
> Matthes
>
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