@Nullable
  public String getNamespace(@NotNull XmlTag context) {
    final DomInvocationHandler handler =
        DomManagerImpl.getDomManager(myProject).getDomHandler(context);

    if (handler == null) {
      return null;
    }
    return handler
        .createEvaluatedXmlName(myDescription.getXmlName())
        .getNamespace(context, handler.getFile());
  }
 @NonNls
 public String getName(final PsiElement context) {
   return getQualifiedAttributeName(context, myDescription.getXmlName());
 }
 private String getLocalName() {
   return myDescription.getXmlName().getLocalName();
 }