void setPublisherModel(PublisherModel publisherModel) {
        this.publisherModel = publisherModel;
    }
Sets the publisher model that specifies who is allowed to publish items to the node.

@param publisherModel the publisher model that specifies who is allowed to publish items
       to the node.
xmppserver/src/main/java/org/jivesoftware/openfire/pubsub/Node.java