(2020-04-15, 21:01)Roland Melkert Wrote: You could use UUID'sThat is the approach I use when you add new sub models using Part Editor in buildinginstructions.js It makes the construction of building instructions faster when you don't ask the user to name each child. In order to reduce the file size, new sub models are named "a", "b", c", ... "aa", "ab", ...
According to the OMR specification, all approaches are acceptable.