@Override
  public boolean isAvailable(@NotNull PsiElement context) {
    PsiFile containingFile = context.getContainingFile();
    if (containingFile instanceof XPathFile) {
      final XmlFile xmlFile = PsiTreeUtil.getContextOfType(containingFile, XmlFile.class);
      if (xmlFile != null && XsltSupport.isXsltFile(xmlFile)) {
        return true;
      }
    }
    return false;
  }
@Override
  public boolean isAvailable(@NotNull PsiElement context)