Hello,
On 12/6/10 3:13 PM, Andreas Granig wrote:
Hi,
I'm having troubles fetching an xpath from an xml document using
presence_xml, so I probably do something wrong (using kamailio 3.0.x):
$xml(x=>doc) = '<?xml version="1.0" encoding="utf-8"?><presence
xmlns="urn:ietf:params:xml:ns:pidf"
entity="sip:t...@mydomain.com"><tuple
id="86ae65b7-42de-4399-b635-295caad13aac"><status><basic>none</basic></status></tuple></presence>';
xlog("L_INFO", "all=$xml(x=>doc)\n");
-> prints the whole document, which is ok
xlog("L_INFO", "tmp1=$xml(x=>xpath:/)\n");
-> also prints the whole document (including the xml tag in the
beginning, not sure if this is ok)
xlog("L_INFO", "tmp2=$xml(x=>xpath:/presence)\n");
-> prints an empty string
How is this actually supposed to work? What I'd like to do in the end is
extracting for example the "none" from the "basic"-tag by specifying
"xpath:/presence/tuple/status/basic", which also returns an empty string
now, also when appended with "/text()".
the problem is in between IETF and XML guys :-)
xpath require to use a prefix for namespaces. The SIMPLE guys liked to
set a default one without prefix.
For this case, try:
modparam("presence_xml", "xml_ns", "pidf=urn:ietf:params:xml:ns:pidf")
then:
xlog("L_INFO",
"tmp2=$xml(x=>xpath:/pidf:presence/pidf:tuple/pidf:status/pidf:basic)\n");
- see which one is giving more convenient resultL with text() or no text()
There are some tricks I did for the xcap_server, because I think this is
not scaling. There I just changed 'xmlns=' in 'xmlnx=' or so, so there
is no namespace without prefix -- then your format for xpath works fine.
Cheers,
Daniel
--
Daniel-Constantin Mierla
Kamailio (OpenSER) Advanced Training
Jan 24-26, 2011, Irvine, CA, USA
http://www.asipto.com
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