Predefined Domain Relations
- entity-centered relations
There is one predefined entity-centered relation, i.e. part_of, which describes the parent-child relationships between entity instances.
- action-centered relations
There are five action-centered relations :

- dm-actor --- corresponding to subject of dm-action
- dm-actee --- corresponding to object of a dm-action
- dm-source --- describing the source
- dm-destination --- describing the destination
- dm-instrument --- referring to the tool used by the action in question