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Application module:
Datum difference based model |
ISO/TS 10303-1660:2018-11(E)
© ISO
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This clause specifies the information requirements for the
Datum difference based model
application module. The information requirements are specified as the
Application Reference Model (ARM) of this application module.
NOTE 1 A graphical representation of the information
requirements is given in
Annex C.
NOTE 2 The mapping specification is specified in
5.1. It shows how
the information requirements are met by using common resources and
constructs defined or imported in the MIM schema of this application
module.
This clause defines the information requirements to which implementations shall
conform using the EXPRESS language as defined in ISO 10303-11.
The following begins the
Datum_difference_based_model_arm
schema and identifies the necessary external references.
EXPRESS specification:
*)
SCHEMA Datum_difference_based_model_arm;
(*
The following EXPRESS interface statements specify the elements
imported from the ARMs of other application modules.
EXPRESS specification:
*)
USE FROM
Geometric_tolerance_arm;
--
ISO/TS 10303-1051
USE FROM
Model_parameter_arm;
--
ISO/TS 10303-1703
USE FROM
Functional_usage_view_arm;
--
ISO/TS 10303-1705
(*
NOTE 1
The schemas referenced above are specified in the following
part of ISO 10303:
| Geometric_tolerance_arm |
ISO/TS 10303-1051 |
| Model_parameter_arm |
ISO/TS 10303-1703 |
| Functional_usage_view_arm |
ISO/TS 10303-1705 |
NOTE 2
See Annex C,
Figures
C.1and C.2
for a graphical representation of this schema.
This subclause specifies the ARM type
for this application module. The ARM type and
definition is specified below.
The dfbm_analytical_model_port_assignment_select type is an extension
of the
analytical_model_port_assignment_select type.
It adds the data
type
Datum_difference
to the list of alternate data types.
NOTE The list of entity data types may be
extended in application modules that use the constructs of
this module.
EXPRESS specification:
*)
TYPE
dfbm_analytical_model_port_assignment_select =
EXTENSIBLE
GENERIC_ENTITY
SELECT
BASED_ON
analytical_model_port_assignment_select
WITH
(Datum_difference);
END_TYPE;
(*
This subclause specifies the ARM entities for this
module. Each ARM application entity is an atomic element that
embodies a unique application concept and contains attributes
specifying the data elements of the entity. The ARM
entities and definitions are specified below.
A Datum_difference is the basis for mapping from a geometric context model into a lexical context model for definitional purposes.
A Datum_difference identifies the length or angular difference between two
Datum.
The difference may be referenced independently of the originating geometric model representation.
NOTE 1
One
Datum
may be located at the origin if a simple location is intended.
NOTE 2
The origin reference for a simple angular difference should be the X axis for two-dimensional case,
and the XY axis for three-dimesional case.
EXPRESS specification:
*)
ENTITY Datum_difference;
precedent_datum : Shape_element;
subsequent_datum : Shape_element;
END_ENTITY;
(*
Attribute definitions:
precedent_datum:
specifies a role of the
Datum
for the Datum_difference. The precedent_datum is the reference datum.
subsequent_datum:
specifies a role of the
Datum
for the Datum_difference. The subsequent_datum is the other datum in the Datum_difference.
A Datum_difference_based_characteristic is a type of
Representation_item.
A Datum_difference_based_characteristic is provided to allow characterization based on a geometric model.
This is typically used where there is a reference geometric model available.
EXPRESS specification:
*)
ENTITY Datum_difference_based_characteristic
SUBTYPE OF (Representation_item);
of_datum_difference : Datum_difference;
END_ENTITY;
(*
Attribute definitions:
of_datum_difference:
specifies a role of the
Datum_difference
for the Datum_difference_based_characteristic.
A Datum_difference_based_model_parameter is a type of Model_parameter. In effect, the Datum_difference provides a geometric basis for the definition of the Model_parameter.
EXPRESS specification:
*)
ENTITY Datum_difference_based_model_parameter
SUBTYPE OF (Model_parameter);
of_datum_difference : Datum_difference;
END_ENTITY;
(*
Attribute definitions:
of_datum_difference:
specifies a role of the Datum_difference for the Datum_difference_based_model_parameter.
A Datum_difference_functional_unit_usage_view_terminal_assignment is a means to provide the ability to map from a geometric context into the functional context of a Functional_unit_definition.
EXPRESS specification:
*)
ENTITY Datum_difference_functional_unit_usage_view_terminal_assignment;
assigned_functional_terminal_definition : Functional_unit_usage_view_terminal_definition;
assigned_datum_difference : Datum_difference;
END_ENTITY;
(*
Attribute definitions:
assigned_functional_terminal_definition:
specifies a role of the Functional_unit_usage_view_terminal_definition for the Datum_difference_functional_unit_usage_view_terminal_assignment.
assigned_datum_difference:
specifies a role of the Datum_difference for the Datum_difference_functional_unit_usage_view_terminal_assignment.
This subclause specifies the ARM subtype constraint for
this module. The subtype constraint places a constraint on the
possible super-type / subtype instantiations.
The ARM subtype constraint and definition is
specified below.
The
ddbm_model_parameter_subtypes
constraint specifies a constraint that applies to instances of
Model_parameter
and enforces the rule that its subtypes
Datum_difference_based_model_parameter and Schema_based_model_parameter
are exclusive.
EXPRESS specification:
*)
SUBTYPE_CONSTRAINT ddbm_model_parameter_subtypes FOR Model_parameter;
ONEOF (Datum_difference_based_model_parameter,
Schema_based_model_parameter);
END_SUBTYPE_CONSTRAINT;
(*
*)
END_SCHEMA; -- Datum_difference_based_model_arm
(*
© ISO 2018 — All rights reserved
