XPath filter gets Namespaces from NotificationMessage
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Key: MUSE-293
URL: https://issues.apache.org/jira/browse/MUSE-293
Project: Muse
Issue Type: Bug
Components: Utilities - General, QName, and XML
Affects Versions: 2.2.0
Reporter: Matthes Rieke
Assignee: Dan Jemiolo
Priority: Minor
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.
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