OOB will always be set under the oob property of any data objects.
Both namespaces are handled (jabber:iq:oob and jabber:x:oob) with jabber:iq:oob also having a parameter for sid (stream ID).
... <query xmlns="jabber:iq:oob" sid="stream-id-1"> <url>http://www.evilprofessor.co.uk</url> <desc>Link description</desc> </query> ...
... <x xmlns="jabber:x:oob"> <url>http://www.evilprofessor.co.uk</url> <desc>Link description</desc> </x> ...
Will be turned into the following:
{ url: "http://www.evilprofessor.co.uk" description: "Link description", stream: "stream-id-1" }
With stream only being supported for jabber:iq:oob namespace. All parameters are optional (XEP-0066 states that only url is required).
Not currently built.