anchor.diff:  %% Returns key for document holding links for given document.
   %% @end
   %%--------------------------------------------------------------------
  --spec links_doc_key(Key :: datastore:key(), Scope :: atom() | mother_scope_fun()) -> BinKey :: binary().
  +-spec links_doc_key(Key :: datastore:key(), Scope :: atom() | binary() | mother_scope_fun()) -> BinKey :: binary().
   links_doc_key(Key, Scope) ->
       Base = links_doc_key_from_scope(Key, Scope),
       case byte_size(Base) > 120 of
  
positive.code: %% Create base for links document key (base must be cut if too long).
  %% @end
  %%--------------------------------------------------------------------
  -spec links_doc_key_from_scope(Key :: datastore:key(), Scope :: atom() | mother_scope_fun()) -> BinKey :: binary().
  links_doc_key_from_scope(Key, ScopeFun) when is_function(ScopeFun) ->
      links_doc_key_from_scope(Key, ScopeFun());
  links_doc_key_from_scope(Key, Scope) when is_binary(Key), is_binary(Scope) ->
  
negative.code:             TmpAns
      end;
  add_non_existing_to_map(_Driver, _ModelConfig, _Key, _LDK, _GetAns, _Link, _KeyNum) ->
      ok.
  