Non-oriented stemma

[Jean-Baptiste-Camps]

@Benedetta-Salvati and I recently merged an unoriented stemma (#138). To encode the absence of orientation, I added dir=none to Benedetta's encoding. Is it something that is enough ? Should we add yet one more metadata field (I'm not enthusiastic about that), not accept unoriented trees (in a way, they are not stemmata), do something else?

[GusRiva]

This was discussed on 17/06/22.

We decided that, at least for now, we only consider directed trees as stemmata. Dealing with undirected graphs would make the data model and the transformations too complex.

The dir=none attribute can be used locally to indicate that there is a connection but it is impossible to decide the direction, but there must be at least one root node.

Feel free to add or correct if I missed something @Jean-Baptiste-Camps @Benedetta-Salvati (or close the issue if there is nothing more to say for the moment)

[Jean-Baptiste-Camps]

I updated our Guidelines to say just that:
OpenStemmata/OpenStemmata.github.io@957f1e4