code: public String getNamespaceForPrefix(String prefix, org.w3c.dom.Node context)
    {
  
      // Don't need to support this here.  Return the current URI for the prefix,
      // ignoring the context.
      assertion(true, "can't process a context node in StylesheetHandler!");
  
      return null;
    }
docs: Given a namespace, get the corrisponding prefix.  This is here only
  to support the {@link org.apache.xml.utils.PrefixResolver} interface,
  and will throw an error if invoked on this object.
  
  @param prefix The prefix to look up, which may be an empty string ("") for the default Namespace.
  @param context The node context from which to look up the URI.
  
  @return The associated Namespace URI, or null if the prefix
  is undeclared in this context.