internal PubSubNode(XmppStream stream, JID jid, string node, int maxItems)
{
if (stream == null)
throw new ArgumentException("must not be null", "stream");
if (node == null)
throw new ArgumentException("must not be null", "node");
if (node == "")
throw new ArgumentException("must not be empty", "node");
m_stream = stream;
m_jid = jid;
m_node = node;
m_items = new ItemList(this, maxItems);
}