'Mark an interest in a PEP subscription by including a disco
feature with the \'+notify\' extension.
Arguments:
namespace -- The base namespace to remove as an interest, such
as \'http://jabber.org/protocol/tune\'. This may also
be a list of such namespaces.
jid       -- Optionally specify the JID.'

def remove_interest(self, namespace, jid=None):

    if (not isinstance(namespace, (set, list))):
        namespace = [namespace]
    for ns in namespace:
        self.xmpp['xep_0030'].del_feature(jid=jid, feature=('%s+notify' % namespace))
    self.xmpp['xep_0115'].update_caps(jid)
