private boolean readNull( StringBuffer b )
	throws IOException,
	       JSONSyntaxException {

	if( !readExpected('u',b) || !readExpected('l',b) || !readExpected('l',b) )
	    throwJSONException( "Unexpected token: " + this.describeCurrentToken() + "; expected null." );

	this.fireNullRead( b.toString() );
	
	return true;
    }