Beware of default namespaces. If you have one defined, then XPath needs to have
a namespace mapped to a dummy prefix, and you have to qualify the prefix. The
following can be referenced using "/x/y".
<x><y>something...
But this has a problem:
<x xmlns="foo"><y>something...
Internally, XML tracks this like "/{foo}:x/{foo}:y". What you have to do is
tell the XPath processor to map some prefix, say 'a' to the namespace 'foo',
then use "/a:x/a:y". Note that the three following XML files are functionally
identical:
<x xmlns="foo"><y>something...
<f:x xmlns:f="foo"><f:y>something...
<nnzz:x xmlns:nnzz="foo"><nnzz:y>something...
If you follow my instructions above, the XPath "/a:x/a:y" will get the element
with the local-name 'y' every time.
You can also use "/*[local-name()='x']/*[local-name()='y']" but that's getting
ugly...
Prefixes are a convenience for serialization purposes. The namespace is what is
real.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Boydell, Stuart
Sent: Thursday, May 20, 2010 2:33 AM
To: U2 Users List
Subject: [U2] XPath queries
Is it just me being dull-witted or do XPath queries in XDOM not work by name?
Linux UV 10.2.7
I have spent quite a few hours trying to get something working and the only way
I can get the node is to specify it by position rather than name.
For example I have to use this format to successfully query if an 'exception'
element exists:
XDOMLocate(dh, '/*[1]/*[2]/*[last()]','',xh)
instead of specifying exactly what I'm looking for with what I believe should
be valid XPath:
XDOMLocate(dh, '/ ABRPayloadSearchResults/response/exception','',xh)
or even better:
XDOMLocate(dh, '//exception','',xh)
both of which return -1.
Anyone got any clues?
Cheers,
Stuart Boydell
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