4 Information requirements

This clause specifies the information requirements for the Part external reference 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 Part_external_reference_arm schema and identifies the necessary external references.

4.1 Required AM ARM

The following EXPRESS interface statement specifies the elements imported from the ARM of another application module.

EXPRESS specification:

*)
USE FROM Part_template_arm;    --  ISO/TS 10303-1722
(*



NOTE 1   The schemas referenced above are specified in the following part of ISO 10303:

Part_template_arm

ISO/TS 10303-1722

NOTE 2   See Annex C, Figures C.1and C.2 for a graphical representation of this schema.

4.2 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.

4.2.1 Package_external_reference   

A Package_external_reference is an unambiguous reference to the definition of a Package in an external system.

NOTE    Package_external_reference is included to permit references to Packaged_part_terminal withouth requiring that a geometric representation be present for the terminal.

EXPRESS specification:

*)
ENTITY Package_external_reference;
  design_owner : STRING;
  part_number : STRING;
  revision_code : STRING;
  product_definition_id : STRING;
END_ENTITY;
(*

Attribute definitions:

design_owner: specifies one role of a string for the Package_external_reference. The design_owner controls the assignment of part_number for the Package being referenced.

part_number: specifies one role of a string for the Package_external_reference. The part_number represents an identifier unique within the organization for packages.

revision_code: specifies one role of a string for the Package_external_reference. The revision_code represents a version of the package, and together with part_number is unique within the organization for packages.

product_definition_id: specifies one role of a string for the Package_external_reference. The product_definition_id represents the identification of the definition of the Package being referenced.

4.2.2 Package_terminal_external_reference   

A Package_terminal_external_reference is an unambiguous reference to a Package_terminal in an external system.

EXAMPLE    Items in a Physical_connectivity_definition may need to reference terminals in a library without duplicating the geometric context.

EXPRESS specification:

*)
ENTITY Package_terminal_external_reference;
  name : STRING;
  associated_definition : Package_external_reference;
UNIQUE
  UR1: associated_definition, name;
END_ENTITY;
(*

Attribute definitions:

name: the words by which the Package_terminal_external_reference is known. The name shall be interpreted as the name attribute inherited by Package_terminal from Shape_element.

associated_definition: specifies a role of the Package_external_reference for the Package_terminal_external_reference.

Formal propositions:

UR1: The combination of associated_definition and name shall be unique within a population of Package_terminal_external_references.

4.2.3 Part_terminal_external_reference   

A Part_terminal_external_reference is a type of Shape_element. A Part_terminal_external_reference is an unambiguous reference to a Part_terminal or to a terminal associated with a type of Template_definition in an external system. A Part_terminal_external_reference specifies the type of the terminal as well as the identification for the terminal.

EXAMPLE    Items in a design definition may need to reference terminals in a library without duplicating the geometric context, and may need to specify terminal types by reference instead of explicit instantiation.

EXPRESS specification:

*)
ENTITY Part_terminal_external_reference
  SUBTYPE OF (General_part_feature);
UNIQUE
  UR1: SELF\Part_shape_element.associated_definition, SELF\Shape_element.element_name;
WHERE
  WR1: SIZEOF(['PART_VIEW_DEFINITION_ARM.PART_VIEW_DEFINITION', 'PART_TEMPLATE_ARM.TEMPLATE_DEFINITION'] * TYPEOF(SELF\Shape_element.associated_definition)) <> 0;
END_ENTITY;
(*

Formal propositions:

UR1: The combination of associated_definition, feature_name and feature_type shall be unique within a population of Part_terminal_external_references.

WR1: The context for the Part_terminal_external_reference shall be a Part_view_definition or shall be a Template_definition.

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