Application module: Datum difference based model ISO/TS 10303-1660:2018-11(E)
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Cover page
Table of contents
Copyright
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
    3.1 Terms and definitions
    3.2 Abbreviated terms

4 Information requirements
   4.1 Required AM ARMs
   4.2 ARM type definition
   4.3 ARM entity definitions
   4.4 ARM subtype constraint definition
5 Module interpreted model
   5.1 Mapping specification
   5.2 MIM EXPRESS short listing
     5.2.1 MIM entity definitions
     5.2.2 MIM subtype constraint definition

A MIM short names
B Information object registration
C ARM EXPRESS-G   EXPRESS-G
D MIM EXPRESS-G   EXPRESS-G
E Computer interpretable listings
F Change history
Bibliography
Index

4 Information requirements

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;
(*

4.1 Required AM ARMs

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.

4.2 ARM type definition

This subclause specifies the ARM type for this application module. The ARM type and definition is specified below.

4.2.1 dfbm_analytical_model_port_assignment_select   EXPRESS-G

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;
(*

4.3 ARM entity definitions

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.

4.3.1 Datum_difference   EXPRESS-GMapping table

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.

4.3.2 Datum_difference_based_characteristic   EXPRESS-GMapping table

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.

4.3.3 Datum_difference_based_model_parameter   EXPRESS-GMapping table

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.

4.3.4 Datum_difference_functional_unit_usage_view_terminal_assignment   EXPRESS-GMapping table

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.

4.4 ARM subtype constraint definition

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.

4.4.1 ddbm_model_parameter_subtypes   EXPRESS-GMapping table

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
(*


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