Module type_

Structs

AttributeType

Attribute types represent properties that other types can own.

EntityType

Entity types represent the classification of independent objects in the data model of the business domain.

RelationType

Relation types (or subtypes of the relation root type) represent relationships between types. Relation types have roles.

RoleType

Roles are special internal types used by relations. We can not create an instance of a role in a database. But we can set an instance of another type (role player) to play a role in a particular instance of a relation type.