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erlangejabberdmongoose-im

Mongooseim match sub element value

I have a child element called Request inside my message element of xmpp packet. Therefore, my packet looks like the below: 

<message to="b" from="a" type="chat"> 
    <request xmlns="urn:client:send-ack"></request> 
</message>

I want to match the value of xmlns attribute inside the request element. So I want to do something like

case xml:get_attr_s(<<"xmlns">>, xml_get_subtag(<<Request>>,Packet)) of
   "urn:client:send-receipts" ->
   %% Do something
   ok.

But, obviously this densest work. Whats the best way to do it ?

Solution

  • Easy and fast way to get this attribute is exml_query:path/2. With it, your case ... of would be following:

    case exml_query:path(Stanza, [{element, <<"request">>}, {attr, <<"xmlns">>}]) of
    <<"urn:client:send-receipts">> -> something;
    _ -> something_else
end