- · A relationship that participates in an entity's unique identifier. – barred relationship
- · The product of the resolution of a many to many relationship. – intersection entity
1. Resolve the M:M between TEACHER and CLASS as well as INTERPRETER and LANGUAGE.
For each intersection entity, think of additional attributes like a UID.
For intersection entity InterpreterLanguageMap, interpreterId from teacher entity and languageId from class entity make unique identifier.