Sowa's updated roles

Sowa's (1999) Knowledge Representation text
19 thematic roles
- See http://www.cs.nmsu.edu/~tomohara/thematic-roles/sowa-thematic-roles.html

Decompositional approach

Better hierarchical structuring
Four broad categories
- intiator, resource, goal, essence
- based on Aristotle's four causes (aitia)
Six categories for verbs
- action, process, transfer, spatial, temporal, ambient