Source : ISO 10303-43
SCHEMA representation_schema;
REFERENCE FROM
basic_attribute_schema -- ISO 10303-41
(get_description_value,
get_id_value);
REFERENCE FROM
measure_schema -- ISO 10303-41
(measure_value,
measure_with_unit);
REFERENCE FROM
support_resource_schema -- ISO 10303-41
(bag_to_set,
identifier,
label,
text);
TYPE compound_item_definition =
SELECT
(list_representation_item,
set_representation_item);
END_TYPE;
TYPE founded_item_select =
SELECT
(founded_item,
representation_item);
END_TYPE;
TYPE list_representation_item =
LIST[1:?] OF representation_item;
END_TYPE;
TYPE set_representation_item =
SET[1:?] OF representation_item;
END_TYPE;
TYPE transformation =
SELECT
(item_defined_transformation,
functionally_defined_transformation);
END_TYPE;
ENTITY compound_representation_item
SUBTYPE OF (representation_item);
item_element : compound_item_definition;
END_ENTITY;
ENTITY definitional_representation
SUBTYPE OF (representation);
WHERE
WR1: 'REPRESENTATION_SCHEMA.PARAMETRIC_REPRESENTATION_CONTEXT' IN TYPEOF (SELF\representation.context_of_items );
END_ENTITY;
ENTITY founded_item;
END_ENTITY;
ENTITY functionally_defined_transformation;
name : label;
description :
OPTIONAL
text;
END_ENTITY;
ENTITY global_uncertainty_assigned_context
SUBTYPE OF (representation_context);
uncertainty : SET[1:?] OF uncertainty_measure_with_unit;
END_ENTITY;
ENTITY item_defined_transformation;
name : label;
description :
OPTIONAL
text;
transform_item_1 : representation_item;
transform_item_2 : representation_item;
END_ENTITY;
ENTITY mapped_item
SUBTYPE OF (representation_item);
mapping_source : representation_map;
mapping_target : representation_item;
WHERE
WR1: acyclic_mapped_representation(using_representations(SELF), [SELF]);
END_ENTITY;
ENTITY parametric_representation_context
SUBTYPE OF (representation_context);
END_ENTITY;
ENTITY representation;
name : label;
items : SET[1:?] OF representation_item;
context_of_items : representation_context;
DERIVE
id : identifier := get_id_value (SELF);
description : text := get_description_value (SELF);
WHERE
WR1: SIZEOF (USEDIN (SELF, 'BASIC_ATTRIBUTE_SCHEMA.' + 'ID_ATTRIBUTE.IDENTIFIED_ITEM'))
<= 1;
WR2: SIZEOF (USEDIN (SELF, 'BASIC_ATTRIBUTE_SCHEMA.' + 'DESCRIPTION_ATTRIBUTE.DESCRIBED_ITEM'))
<= 1;
END_ENTITY;
ENTITY representation_context;
context_identifier : identifier;
context_type : text;
INVERSE
representations_in_context : SET[1:?] OF representation FOR context_of_items;
END_ENTITY;
ENTITY representation_item;
name : label;
WHERE
WR1: SIZEOF(using_representations(SELF)) > 0;
END_ENTITY;
ENTITY representation_item_relationship;
name : label;
description :
OPTIONAL
text;
relating_representation_item : representation_item;
related_representation_item : representation_item;
END_ENTITY;
ENTITY representation_map;
mapping_origin : representation_item;
mapped_representation : representation;
INVERSE
map_usage : SET[1:?] OF mapped_item FOR mapping_source;
WHERE
WR1: item_in_context(SELF.mapping_origin, SELF.mapped_representation.context_of_items);
END_ENTITY;
ENTITY representation_relationship;
name : label;
description :
OPTIONAL
text;
rep_1 : representation;
rep_2 : representation;
END_ENTITY;
ENTITY representation_relationship_with_transformation
SUBTYPE OF (representation_relationship);
transformation_operator : transformation;
WHERE
WR1: SELF\representation_relationship.rep_1.context_of_items :<>: SELF\representation_relationship.rep_2.context_of_items;
END_ENTITY;
ENTITY uncertainty_assigned_representation
SUBTYPE OF (representation);
uncertainty : SET[1:?] OF uncertainty_measure_with_unit;
END_ENTITY;
ENTITY uncertainty_measure_with_unit
SUBTYPE OF (measure_with_unit);
name : label;
description :
OPTIONAL
text;
WHERE
WR1: valid_measure_value (SELF\measure_with_unit.value_component);
END_ENTITY;
ENTITY value_representation_item
SUBTYPE OF (representation_item);
value_component : measure_value;
WHERE
WR1: SIZEOF (QUERY (rep <* using_representations (SELF) | NOT ('MEASURE_SCHEMA.GLOBAL_UNIT_ASSIGNED_CONTEXT' IN
TYPEOF (rep.context_of_items) ))) = 0;
END_ENTITY;
FUNCTION acyclic_mapped_representation
(parent_set : SET OF representation; children_set : SET OF representation_item) : BOOLEAN;
LOCAL
x,y : SET OF representation_item;
END_LOCAL;
-- Determine the subset of children_set that are mapped_items
x := QUERY(z <* children_set | 'REPRESENTATION_SCHEMA.MAPPED_ITEM'
IN TYPEOF(z));
-- Determine that the subset has elements
IF SIZEOF(x) > 0 THEN
-- Check each element of the set
REPEAT i := 1 TO HIINDEX(x);
-- If the selected element maps a representation in the
-- parent_set, then return false
IF x[i]\mapped_item.mapping_source.mapped_representation
IN parent_set THEN
RETURN (FALSE);
END_IF;
-- Recursive check of the items of mapped_representation
IF NOT acyclic_mapped_representation
(parent_set +
x[i]\mapped_item.mapping_source.mapped_representation,
x[i]\mapped_item.mapping_source.mapped_representation.items) THEN
RETURN (FALSE);
END_IF;
END_REPEAT;
END_IF;
-- Determine the subset of children_set that are not
-- mapped_items
x := children_set - x;
-- Determine that the subset has elements
IF SIZEOF(x) > 0 THEN
-- For each element of the set:
REPEAT i := 1 TO HIINDEX(x);
-- Determine the set of representation_items referenced
y := QUERY(z <* bag_to_set( USEDIN(x[i], '')) |
'REPRESENTATION_SCHEMA.REPRESENTATION_ITEM' IN TYPEOF(z));
-- Recursively check for an offending mapped_item
-- Return false for any errors encountered
IF NOT acyclic_mapped_representation(parent_set, y) THEN
RETURN (FALSE);
END_IF;
END_REPEAT;
END_IF;
-- Return true when all elements are checked and
-- no error conditions found
RETURN (TRUE);
END_FUNCTION;
FUNCTION item_in_context
(item : representation_item; cntxt : representation_context) : BOOLEAN;
LOCAL
y : BAG OF representation_item;
END_LOCAL;
-- If there is one or more representation using both the item
-- and cntxt return true.
IF SIZEOF(USEDIN(item,'REPRESENTATION_SCHEMA.REPRESENTATION.ITEMS')
* cntxt.representations_in_context) > 0 THEN
RETURN (TRUE);
-- Determine the bag of representation_items that reference
-- item
ELSE y := QUERY(z <* USEDIN (item , '') |
'REPRESENTATION_SCHEMA.REPRESENTATION_ITEM' IN TYPEOF(z));
-- Ensure that the bag is not empty
IF SIZEOF(y) > 0 THEN
-- For each element in the bag
REPEAT i := 1 TO HIINDEX(y);
-- Check to see it is an item in the input cntxt.
IF item_in_context(y[i], cntxt) THEN
RETURN (TRUE);
END_IF;
END_REPEAT;
END_IF;
END_IF;
-- Return false when all possible branches have been checked
-- with no success.
RETURN (FALSE);
END_FUNCTION;
FUNCTION using_items
(item : founded_item_select; checked_items : SET OF founded_item_select) : SET OF founded_item_select;
LOCAL
new_check_items : SET OF founded_item_select;
result_items : SET OF founded_item_select;
next_items : SET OF founded_item_select;
END_LOCAL;
result_items := [];
new_check_items := checked_items + item;
-- Find the set of representation_items or founded_items
-- in which item is used directly.
next_items := QUERY(z <* bag_to_set( USEDIN(item , '')) |
('REPRESENTATION_SCHEMA.REPRESENTATION_ITEM' IN TYPEOF(z)) OR
('REPRESENTATION_SCHEMA.FOUNDED_ITEM' IN TYPEOF(z)));
-- If the set of next_items is not empty;
IF SIZEOF(next_items) > 0 THEN
-- For each element in the set, find the using_items recursively
REPEAT i := 1 TO HIINDEX(next_items);
-- Check for loop in data model, i.e. one of the next_items
-- occurred earlier in the set of check_items;
IF NOT(next_items[i] IN new_check_items) THEN
result_items := result_items + next_items[i] +
using_items(next_items[i],new_check_items);
END_IF;
END_REPEAT;
END_IF;
-- return the set of representation_items or founded_items
-- in which the input item is used directly and indirectly.
RETURN (result_items);
END_FUNCTION;
FUNCTION using_representations
(item : founded_item_select) : SET OF representation;
LOCAL
results : SET OF representation;
result_bag : BAG OF representation;
intermediate_items : SET OF founded_item_select;
END_LOCAL;
-- Find the representations in which the item is used and add to the
-- results set.
results := [];
result_bag :=
USEDIN(item,'REPRESENTATION_SCHEMA.REPRESENTATION.ITEMS');
IF SIZEOF(result_bag) > 0 THEN
REPEAT i := 1 TO HIINDEX(result_bag);
results := results + result_bag[i];
END_REPEAT;
END_IF;
-- Find all representation_items or founded_items
-- by which item is referenced directly or indirectly.
intermediate_items := using_items(item,[]);
-- If the set of intermediate items is not empty;
IF SIZEOF(intermediate_items) > 0 THEN
-- For each element in the set, add the
-- representations of that element.
REPEAT i := 1 TO HIINDEX(intermediate_items);
result_bag := USEDIN(intermediate_items[i],
'REPRESENTATION_SCHEMA.REPRESENTATION.ITEMS');
IF SIZEOF(result_bag) > 0 THEN
REPEAT j := 1 TO HIINDEX(result_bag);
results := results + result_bag[j];
END_REPEAT;
END_IF;
END_REPEAT;
END_IF;
-- Return the set of representation in which the input item is
-- used directly and indirectly (through intervening
-- representation_items or founded items).
RETURN (results);
END_FUNCTION;
FUNCTION valid_measure_value
(m : measure_value) : BOOLEAN;
IF ('REAL' IN TYPEOF (m)) THEN
RETURN (m > 0.0);
ELSE
IF ('INTEGER' IN TYPEOF (m)) THEN
RETURN (m > 0);
ELSE
RETURN (TRUE);
END_IF;
END_IF;
END_FUNCTION;
END_SCHEMA; -- representation_schema