Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
We define the number of subtypes of a relationship as a measure of its complexity. Subtypes can be categorical — one subtype of ride can be expressed as <person - ride - bike> while another is <dog - ride - surfboard>. Subtypes can also be spatial—carry has a subtype with a small object carried to the side and another with a large object carried overhead.
