def items(requestor, service, nodeIdentifier, maxItems, itemIdentifiers):
    """
        Called when a items retrieval request has been received.

        @param requestor: The entity the request originated from.
        @type requestor: L{JID<twisted.words.protocols.jabber.jid.JID>}
        @param service: The entity the request was addressed to.
        @type service: L{JID<twisted.words.protocols.jabber.jid.JID>}
        @param nodeIdentifier: The identifier of the node to retrieve items
                               from.
        @type nodeIdentifier: C{unicode}
        """
