EnsureUAStyleSheet();
nsContentDLF::CreateInstance(nsIInputStream& aInputStream,                            const char* aContentType,                            const char* aCommand,                            nsISupports* aContainer,                            nsISupports* aExtraInfo,                            nsIContentViewer** aDocViewer){  nsresult status = NS_ERROR_FAILURE;  // Try RDF  int typeIndex = 0;  while (gRDFTypes[typeIndex]) {    if (0 == PL_strcmp(gRDFTypes[typeIndex++], aContentType)) {      return CreateXULDocumentFromStream(aInputStream,                                         aCommand,                                         aContainer,                                         aExtraInfo,                                         aDocViewer);    }  }  return status;}