def getDiscoItems(requestor, target, nodeIdentifier=''):
    """
        Get contained items for this entity, node.

        @param requestor: The entity the request originated from.
        @type requestor: L{JID<twisted.words.protocols.jabber.jid.JID>}
        @param target: The target entity to which the request is made.
        @type target: L{JID<twisted.words.protocols.jabber.jid.JID>}
        @param nodeIdentifier: The optional identifier of the node at this
                               entity to retrieve the identify and features of.
                               The default is C{''}, meaning the root node.
        @type nodeIdentifier: C{unicode}
        """
