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relationship

A <relationship> is an <abstract_object> that indicates something that one thing has to do with another.
NOTE Only classes of binary relationship are supported. More complex objects can be supported using <multidimensional_object> and <class_of_multidimensional_object>.

EXPRESS specification:

ENTITY relationship
ABSTRACT SUPERTYPE OF (ONEOF(composition_of_individual, cause_of_event, connection_of_individual, lifecycle_stage, relative_location, individual_used_in_connection, involvement_by_reference, specialization, other_relationship, classification, class_of_relationship_with_signature, intended_role_and_domain, possible_role_and_domain, representation_of_thing, usage_of_representation, responsibility_for_representation, approval, comparison_of_property, functional_mapping, recognition, indirect_property, temporal_sequence))
SUBTYPE OF ( abstract_object);
END_ENTITY;

References (24):

Name Type Referred through Express-G
abstract_object Entity
Subtype
Diagram 1
approval Entity
Supertype
Attribute 'approved'
Diagram 23
cause_of_event Entity
Supertype
Diagram 9
class_of_relationship_with_signature Entity
Supertype
Diagram 13
classification Entity
Supertype
Diagram 2
comparison_of_property Entity
Supertype
Diagram 26
composition_of_individual Entity
Supertype
Diagram 6
connection_of_individual Entity
Supertype
Diagram 21
functional_mapping Entity
Supertype
Diagram 15
indirect_property Entity
Supertype
Diagram 26
individual_used_in_connection Entity
Supertype
Diagram 21
intended_role_and_domain Entity
Supertype
Diagram 24
involvement_by_reference Entity
Supertype
Diagram 9
lifecycle_stage Entity
Supertype
Diagram 23
other_relationship Entity
Supertype
Diagram 11
possible_role_and_domain Entity
Supertype
Diagram 24
recognition Entity
Supertype
Diagram 9
relative_location Entity
Supertype
Diagram 22
representation_of_thing Entity
Supertype
Diagram 16
responsibility_for_representation Entity
Supertype
Diagram 16
specialization Entity
Supertype
Diagram 2
temporal_sequence Entity
Supertype
Diagram 22
usage_of_representation Entity
Supertype
Diagram 16

Inheritance graph

ENTITY relationship;
ENTITY thing;
id  :  STRING;
record_copy_created  :  OPTIONAL representation_of_Gregorian_date_and_UTC_time;
record_created  :  OPTIONAL representation_of_Gregorian_date_and_UTC_time;
record_creator  :  OPTIONAL possible_individual;
record_logically_deleted  :  OPTIONAL representation_of_Gregorian_date_and_UTC_time;
why_deleted  :  OPTIONAL class_of_information_representation;
ENTITY abstract_object;
ENTITY relationship;
END_ENTITY;