Source : ISO 10303-41
SCHEMA external_reference_schema;
REFERENCE FROM
basic_attribute_schema -- ISO 10303-41
(description_attribute,
description_attribute_select,
get_description_value);
REFERENCE FROM
support_resource_schema -- ISO 10303-41
(label,
text,
identifier,
bag_to_set);
TYPE ers_description_attribute_select =
SELECT
BASED_ON
description_attribute_select
WITH
(external_source);
END_TYPE;
TYPE message =
STRING;
END_TYPE;
TYPE source_item =
SELECT
(identifier,
message);
END_TYPE;
ENTITY external_source;
source_id : source_item;
DERIVE
description : text := get_description_value(SELF);
WHERE
WR1: SIZEOF(USEDIN(SELF, 'BASIC_ATTRIBUTE_SCHEMA.' + 'DESCRIPTION_ATTRIBUTE.DESCRIBED_ITEM')) <= 1;
END_ENTITY;
ENTITY external_source_relationship;
name : label;
description :
OPTIONAL
text;
relating_source : external_source;
related_source : external_source;
END_ENTITY;
ENTITY externally_defined_item;
item_id : source_item;
source : external_source;
END_ENTITY;
ENTITY externally_defined_item_relationship;
name : label;
description :
OPTIONAL
text;
relating_item : externally_defined_item;
related_item : externally_defined_item;
END_ENTITY;
ENTITY externally_defined_item_with_multiple_references
SUBTYPE OF (externally_defined_item);
references : LIST[1:?] OF
UNIQUE
source_item;
UNIQUE
UR1: references;
WHERE
WR1: NOT(SELF\externally_defined_item.item_id IN references);
END_ENTITY;
ENTITY pre_defined_item;
name : label;
END_ENTITY;
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;
FUNCTION acyclic_externally_defined_item_relationship
(relation : externally_defined_item_relationship; relatives : SET[1:?] OF externally_defined_item; specific_relation : STRING) : BOOLEAN;
LOCAL
x : SET OF externally_defined_item_relationship;
END_LOCAL;
IF relation.relating_item IN relatives THEN
RETURN (FALSE);
END_IF;
x := QUERY(edi <* bag_to_set(USEDIN(relation.relating_item, 'EXTERNAL_REFERENCE_SCHEMA.' + 'EXTERNALLY_DEFINED_ITEM_RELATIONSHIP.' + 'RELATED_ITEM')) | specific_relation IN TYPEOF(edi));
REPEAT i := 1 TO HIINDEX(x);
IF NOT acyclic_externally_defined_item_relationship(x[i], relatives + relation.relating_item, specific_relation) THEN
RETURN (FALSE);
END_IF;
END_REPEAT;
RETURN (TRUE);
END_FUNCTION;
END_SCHEMA; -- external_reference_schema