FUNCTION acyclic_printed_part_template_material_link
(relation : Printed_part_template_material_link; relatives : SET [1:?] OF Template_material_cross_section_boundary; specific_relation : STRING) : BOOLEAN;
LOCAL
x : SET OF Printed_part_template_material_link := [];
END_LOCAL;
IF relation.precedent_material IN relatives THEN
RETURN (FALSE);
END_IF;
x := QUERY(pd <* bag_to_set(USEDIN(relation.precedent_material,
'PRINTED_PHYSICAL_LAYOUT_TEMPLATE_ARM.' +
'PRINTED_PART_TEMPLATE_MATERIAL_LINK.' +
'SUBSEQUENT_MATERIAL')) | specific_relation IN TYPEOF(pd));
REPEAT i := 1 TO HIINDEX(x);
IF NOT acyclic_printed_part_template_material_link(x[i], relatives +
relation.precedent_material, specific_relation) THEN
RETURN (FALSE);
END_IF;
END_REPEAT;
RETURN (TRUE); END_FUNCTION; -- acyclic_printed_part_template_material_link
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