...
- identity (unique identifier)
- type (individual or group; if group, what type of group, e.g. organisation, company or movement)
An actvityactivity
- location
- start time
- end time (possibly)
- agentobjective (create, reduce, destroy, avoid)
- inputs (e.g. materials and energy; consumables and non-consumables)
- outputs
- processes
- objective (create, reduce, destroy, avoid)
A state
- location
- point in time
- metrics
...