[SR-Users] Publish XML and xpath

[Daniel-Constantin Mierla]

For sake of correctness, as I tried to figure out again searching the
web what the actual issue, the conflict seems to be with XPATH
specifications that don't define default xmlns scope, they have NULL
scope for no-prefix tags which is not the same as the default xmlns. Not
100% sure, as I didn't want to waste to much time, but looks more like
this one.

Cheers,
Daniel

On 10.02.22 16:52, Daniel-Constantin Mierla wrote:
>
> Hello,
>
> actually the problem is the mess SIMPLE RFC authors made with XML
> namespaces, by not setting and not using a prefix for them, otherwise
> the #012 is end-of-line printed by syslog as octal character.
>
> The solutions:
>
> 1) replace "xmlns=" with something else like "xyzwq=":
>
> $xml(body=>doc) = $(rb{s.replace,xmlns=,xyzwq=})
>
> and use xpath without concerning of xml namespaces prefix.
>
> 2) register a prefix for the namespace using xml_ns parameter from
> xmlops module and use that prefix in xpath expressions.
>
> See a past discussion on the mailing list:
>
>    -
> https://lists.kamailio.org/pipermail/sr-users/2010-December/066690.html
>
> Cheers,
> Daniel
>
> On 10.02.22 16:25, Igor Olhovskiy wrote:
>>
>> Hello
>>
>> Just to add, when I'm trying to dump $rb to logs, I'm getting this line
>>
>> <?xml version="1.0"?>#012<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full" entity="sip:88881 at dev.company">#012  <dialog id="f-XGMVyeO0" direction="recipient">#012    <state>terminated</state>#012  </dialog>#012</dialog-info>
>>
>> So, I expect problem is in this #012 + extra spaces. Is there a way
>> to clean it up in an easy way?
>>
>> Regards,
>> Igor
>> Le 10.02.2022 à 16:01, Igor Olhovskiy a écrit :
>>>
>>> Hello,
>>>
>>> I'm trying to get state of endpoint from PUBLISH message in a most
>>> simple way using xmlops module
>>>
>>> Trying to make this
>>>
>>> $xml(body=>doc) = $rb;
>>> log("L_ERR", "$rU is now in state $xml(body=>xpath:/dialog-info/dialog/state)\n");
>>>
>>> XML in PUBLISH itself
>>>
>>> <?xml version="1.0"?>
>>> <dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full" entity="sip:88881 at dev.company">
>>>   <dialog id="v6qmEYf5yI" direction="initiator">
>>>     <state>confirmed</state>
>>>   </dialog>
>>> </dialog-info>
>>>
>>>
>>> Actual text in log is
>>>
>>> ... <script>: 88881 is now in state
>>>
>>> Means it's empty. xmlops module is loaded with no parameters. Tried
>>> also string
>>>
>>> $xml(body=>xpath:/dialog-info/dialog/state/text())
>>>
>>> -> same result
>>>
>>> What am I missing here?
>>>
>>> kamailio 5.4.6
>>>
>>> -- 
>>> Thanks in advance,
>>> Igor
>>
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> -- 
> Daniel-Constantin Mierla -- www.asipto.com
> www.twitter.com/miconda -- www.linkedin.com/in/miconda
> Kamailio Advanced Training - Online
>   Feb 21-24, 2022 (America Timezone)
>   * https://www.asipto.com/sw/kamailio-advanced-training-online/

-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - Online
  Feb 21-24, 2022 (America Timezone)
  * https://www.asipto.com/sw/kamailio-advanced-training-online/
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