Schema: group_schema

Source : ISO 10303-41



SCHEMA group_schema;

 REFERENCE FROM support_resource_schema   -- ISO 10303-41
  (label,
   bag_to_set,
   identifier,
   text);

REFERENCE FROM basic_attribute_schema   -- ISO 10303-41
  (get_id_value,
   id_attribute,
   id_attribute_select);


TYPE gs_id_attribute_select = SELECT BASED_ON id_attribute_select WITH
   (group);
END_TYPE;

ENTITY group;
  name : label;
  description : OPTIONAL text;
DERIVE
  id : identifier := get_id_value(SELF);
WHERE
  WR1: SIZEOF(USEDIN(SELF, 'BASIC_ATTRIBUTE_SCHEMA.' + 'ID_ATTRIBUTE.IDENTIFIED_ITEM')) <= 1;
END_ENTITY;

ENTITY group_relationship;
  name : label;
  description : OPTIONAL text;
  relating_group : group;
  related_group : group;
END_ENTITY;

FUNCTION acyclic_group_relationship
 (relation : group_relationship; relatives : SET[1:?] OF group; specific_relation : STRING) : BOOLEAN; 
LOCAL
      x : SET OF group_relationship;
    END_LOCAL;

    IF relation.relating_group IN relatives THEN
      RETURN (FALSE);
    END_IF;
    x := QUERY(grp <* bag_to_set(USEDIN(relation.relating_group, 'GROUP_SCHEMA.' + 'GROUP_RELATIONSHIP.' + 'RELATED_GROUP')) | specific_relation IN TYPEOF(grp));
    REPEAT i := 1 TO HIINDEX(x);
      IF NOT acyclic_group_relationship(x[i], relatives + relation.relating_group, specific_relation) THEN
        RETURN (FALSE);
      END_IF;
    END_REPEAT;
    RETURN (TRUE);
END_FUNCTION;

END_SCHEMA;  -- group_schema