de></a> specific
 tag library URI and tag name.  The runtime must support this method operating
 for the Facelets VDL.
 Other kinds of <code>ViewDeclarationLanguage</code> may be supported but are not
 required to be supported. For backward compatibility
 with decorated <code>ViewDeclrationLanguage</code> implementations that do
 not override this method, a default implementation is provided that returns
 <code>null</code>.  However, any implementation that is compliant with the
 version of the specificatio