</code> is 
   asynchronous, <code>null</code> is returned since the document 
   object may not yet be constructed when this method returns.<DT><B>Throws:</B><DD><A HREF="../../../../org/w3c/dom/DOMException.html">DOMException</A> - INVALID_STATE_ERR: Raised if the <code>LSParser</code>'s 
   <code>LSParser.busy</code> attribute is <code>true</code>.<DD><A HREF="../../../../org/w3c/dom/ls/LSException.html">LSException</A> - PARSE_ERR: Raised if the <code>LSParser</code> was unable to load 
   the XML docum