It was subsequently refined and expanded by R. Houston and O. Biermacher and others.

Entity and relation annotations:
id: 0
type: entity
value: text: R. Houston
labels: <Person>
id: 1
type: entity
value: text: O. Biermacher
labels: <Person>
type: relation
to_id: 1
labels: Person:business/work:Person
from_id: 0