relationship api

"Relationship" I understood as relationships between fields (nodes are many relationships, which are subject of more advanced process).

Wanted features:

1. Powerful and without limitation thanks to the most abstract (see: "everything is a field", compare this to: Global CCK fields, A controversial(?) point: store translations as nodes).
2. Build-in categorization features.
3. Build-in views features (listing fields, not necessary nodes).
4. Build-in menu features.
5. Support for Semantic Web/Microformats/similar.

Observations about current situation:

i've had this sitting around in my sandbox for a while, but with the 4.8/5.0 dev cycle, I was too busy to do much with it. it's a proposed relationship API for inclusion into drupal's core.

Schema-wise, it works like this:

required fields:
rid -- the relationship id. just an auto-id to give us something concrete to connect to. term_node lacks this, and it's a PAIN.
source_nid
target_nid -- the two nodes being connected to each other
relationship_type -- a simple descriptor like 'child' for a book page or 'comment' for a comment or 'describes' for a taxonomy-term-as-a-node.

optional fields: