sig
type t =
NO_ERR
| INDEX_SIZE_ERR
| DOMSTRING_SIZE_ERR
| HIERARCHY_REQUEST_ERR
| WRONG_DOCUMENT_ERR
| INVALID_CHARACTER_ERR
| NO_DATA_ALLOWED_ERR
| NO_MODIFICATION_ALLOWED_ERR
| NOT_FOUND_ERR
| NOT_SUPPORTED_ERR
| INUSE_ATTRIBUTE_ERR
| INVALID_STATE_ERR
| SYNTAX_ERR
| INVALID_MODIFICATION_ERR
| NAMESPACE_ERR
| INVALID_ACCESS_ERR
end