OpenAtlas

As discussed in the last Welterbe meeting we still need a solution for multiple place supers.

Current scenario (simplified):

• There are Places like estates
• There are Features like border stones
• A border stone can be located in two estates (directly at the border)

I already thought about using Place types but this wouldn't work in this case because:

• They already need it for something different and will use it with the upcoming custom place type feature (#2505). If I remember correctly it was for "Kastralgemeinden".
• The places (e.g. estate) have a lot of additional information that can't be tracked via a type. So a "normal" entity is needed.

One approach would be to implement multiple supers for place, but it would mean a lot of work and challenges like:

• How do we manage situations like
  • A is super of B and C
  • X is super of Y and Z
  • But M has supers A and Y
• How would the breadcrumb work
• Danger of recursive relations
• It could break a lot of existing functionality

If we decided to go that direction I would stay away from implementing it everywhere at once (Place, Feature, Strategraphic Unit, Human remains) in the first step. My 2 approaches would be:

• Implement place subs (#2436) and allow only for places to have multiple super. In this case estates and border stones would be places.
• Implement that features can have multiple places as super

Although more work I would prefer the first approach because place subs would help with issues of other cooperation partners too.

Ideas how to solve this more easily or comments about implementing supers are welcome.