public PermittedTaglibsTLV() 
{
	super();
	init();
}

 public  void release() 
{
	super.release();
	init();
}

 public synchronized ValidationMessage[] validate(String prefix,
    String uri,
    PageData page) 
{
	try {
	    // initialize
	    this.uri = uri;
	    permittedTaglibs = readConfiguration();
	    // get a handler
	    DefaultHandler h = new PermittedTaglibsHandler();
	    // parse the page
	    SAXParserFactory f = SAXParserFactory.newInstance();
	    f.setValidating(true);
	    SAXParser p = f.newSAXParser();
	    p.parse(page.getInputStream(), h);
	    if (failed)
		return vmFromString(
		    "taglib " + prefix + " (" + uri + ") allows only the "
		    + "following taglibs to be imported: " + permittedTaglibs);
	    else
		return null;
	} catch (SAXException ex) {
	    return vmFromString(ex.toString());
	} catch (ParserConfigurationException ex) {
	    return vmFromString(ex.toString());
	} catch (IOException ex) {
	    return vmFromString(ex.toString());
	}
}