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A relationship represents a connecton between entities and are described with EOJoin’s. A join defines source and destination attributes – The attributes of the joining entity which must match.
A relationship may be of type to-one or to-many. In a to-many the destination will be an array of objects, and a to-one relationships destination a single object.
Typically a relationship is a class property. Yet some relationships may soley be used for flattening other relationships which are class properties, yet need not be class properties themselves.