DE> - The <code>LSInput</code> from which the source document 
   is to be read. The source document must be an XML fragment, i.e. 
   anything except a complete XML document (except in the case where 
   the context node of type <code>DOCUMENT_NODE</code>, and the action 
   is <code>ACTION_REPLACE_CHILDREN</code>), a DOCTYPE (internal 
   subset), entity declaration(s), notation declaration(s), or XML or 
   text declaration(s).<DD><CODE>contextArg</CODE> - The node that is used as the context for the dat