return null;
    public Node appendAttributes(NodeList attribs)            throws DOMException {    	NodeList duplicateAttrs = findDupAttributes(attribs);    	if(duplicateAttrs != null) {    		removeAppendAttributes(duplicateAttrs, attribs);    		return null;    	} else {	        DocumentImpl prevDoc = new DocumentImpl(ownerDocument);	        Node node = null;	        NodeImpl lastAttrib = getLastAttribute();	        if (children == 0) {	            // no children: append a new child	            node = appendChildren(firstChildID(), this, getPath(), attribs, true);	        }	        else {	            final int level = ownerDocument.getTreeLevel(gid);	            ownerDocument.reindex = level + 1;	            if (lastAttrib != null && lastAttrib.gid == lastChildID())	                node = appendChildren(lastChildID() + 1, lastAttrib, getPath(), attribs, true);	            else	                node = appendChildren(firstChildID() + 1, this, getPath(), attribs, true);	        }	        ownerDocument.broker.update(this);	        ownerDocument.broker.reindex(prevDoc, ownerDocument, null);	        return node;    	}    }