FUNCTION acyclic_external_source_relationship
(relation : external_source_relationship, relatives : SET [1:?] OF external_source, specific_relation : STRING) : BOOLEAN;
LOCAL
x : SET OF external_source_relationship;
END_LOCAL;
IF relation.relating_source IN relatives THEN
RETURN (FALSE);
END_IF;
x := QUERY(es <* bag_to_set(USEDIN(relation.relating_source, 'EXTERNAL_REFERENCE_SCHEMA.' + 'EXTERNAL_SOURCE_RELATIONSHIP.' + 'RELATED_SOURCE')) | specific_relation IN TYPEOF(es));
REPEAT i := 1 TO HIINDEX(x);
IF NOT acyclic_external_source_relationship(x[i], relatives + relation.relating_source, specific_relation) THEN
RETURN (FALSE);
END_IF;
END_REPEAT;
RETURN (TRUE); END_FUNCTION; -- acyclic_external_source_relationship
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