@Override
    public String toString() {
        return super.toString() + " - ID: " + nodeID;
    }
Returns a list with the subscriptions to the node that are pending to be approved by
a node owner. If the node is not using the access model
{@link org.jivesoftware.openfire.pubsub.models.AuthorizeAccess} then the result will
be an empty collection.

@return a list with the subscriptions to the node that are pending to be approved by
        a node owner.
xmppserver/src/main/java/org/jivesoftware/openfire/pubsub/Node.java