Like Movie
Category, an authoritative set of production positions.
A crew member, someone who works on a movie
who is not an actor.
Ternary relationship,
connecting a Movie, a Crew member, and
a Production Category (e.g. director, writer, set
designer, ...) This allows for multiple crew members serving
the same role, e.g. multiple directors.
A crew member has one name.
A many:many relationship, allowing a crew
member to have other names. The same name may belong to different
people.