@Override
  public boolean isReadWriteAccessible(final @NotNull PsiElement element) {
    return element instanceof XmlAttributeValue ||
        element instanceof XmlTag ||
        element instanceof XmlElementDecl ||
        element instanceof XmlComment; // e.g. <!--@elvariable name="xxx" type="yyy"-->
  }
@Override
  public boolean isReadWriteAccessible(final @NotNull PsiElement element)