This feature is mostly used in North America in National Football League contracts.

Entity and relation annotations:
id: 0
type: entity
value: text: North America
labels: <Location>
id: 1
type: entity
value: text:  America
labels: <Location>
id: 2
type: entity
value: text: National Football League contracts
labels: <Regulation>
id: 3
type: entity
value: text: National Football League
labels: <Organization>
type: relation
to_id: 2
labels: Organization:Establishes:Title
from_id: 3
type: relation
to_id: 1
labels: Location:located_in:Location
from_id: 0