Movies are identified by their title and year of release $($the combination of a movie title and its

year is unique$).$ They have a length in minutes. They also have a studio that produces the movie.

Movies are classified under one or more genres $($such as horror, action, drama etc$).$ Movies are

directed by one or more directors and have one or more actors acting in them. The movie also

has a plot outline.

$$ Actors are identified by their names and date of birth. They act in one or more movies. Each

actor has a role in the movie.

$$ Directors are also identified by their names and date of birth. They direct one or more movies. It

is possible for a director to act in a movie $($not necessarily in a movie they direct$).$

$$ Studios are identified by their names. They have an address. They may produce zero or more

movies