2a. ENTITY Data Types

An ENTITY data type used to establish a relationship.

ENTITY group_relationship;

name : label;
description : text;
relating_group : group;
related_group : group;
END_ENTITY;

ENTITY group;
group_name : label;
group_description : text;
END_ENTITY;

The group_relationship entity has two attributes named having the data type group.
This effectively relates the group_relationship with two groups,
and hence relates two groups to each other.

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