4 Information requirements

This clause specifies the information requirements for the Change management 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 Change_management_arm schema and identifies the necessary external references.

A Change represents an identified group of detailed changes, represented by Change_element. The detailed changes are either:

• Add_element to specify that one or several objects are added;
• Delete_element to specify that one or several objects are deleted;
• Modify_element to specify that one or several objects are modified;
• Modify_single_element to specify that a single object is modified where both the original and the new object is given.

The detailed changes may have effect on the identified object as a whole, or only on a specified attribute of these objects. A needed the sequence of detailed changes can be specified by Change_element_sequence.

For the purpose to describe a Change both the previous and current objects must be available. The groups of previous and current objects may be represented by a relation that is referenced by described_change.

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 Approval_arm;    --  ISO/TS 10303-1012



USE FROM Basic_data_representation_arm;    --  ISO/TS 10303-1773



USE FROM Product_version_relationship_arm;    --  ISO/TS 10303-1020



USE FROM Support_resource_arm;    --  ISO/TS 10303-1800
(*



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

Approval_arm	ISO/TS 10303-1012
Basic_data_representation_arm	ISO/TS 10303-1773
Product_version_relationship_arm	ISO/TS 10303-1020
Support_resource_arm	ISO/TS 10303-1800

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

4.2 ARM type definitions

This subclause specifies the ARM types for this application module. The ARM types and definitions are specified below.

4.2.1 change_management_object   

The change_management_object type is an extensible list of alternate data types. Additional alternate data types are specified in select data types that extend the change_management_object type.

NOTE   This empty extensible select requires extension in a further module to ensure that entities that refer to it have at least one valid instantiation.

EXPRESS specification:

*)
TYPE change_management_object = EXTENSIBLE GENERIC_ENTITY SELECT;
END_TYPE;
(*

4.2.2 change_relationship_select   

The change_relationship_select type is an extensible list of alternate data types that allows for the designation of the data type Product_version_relationship.

NOTE   The list of entity data types may be extended in application modules that use the constructs of this module.

EXPRESS specification:

*)
TYPE change_relationship_select = EXTENSIBLE GENERIC_ENTITY SELECT
   (Product_version_relationship);
END_TYPE;
(*

4.2.3 dm_approval_item   

The dm_approval_item type is an extension of the approval_item type. It adds the data type Frozen_assignment 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 dm_approval_item = EXTENSIBLE GENERIC_ENTITY SELECT BASED_ON approval_item WITH
   (Frozen_assignment);
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 Add_element   

EXPRESS specification:

*)
ENTITY Add_element
  SUBTYPE OF (Change_element);
  current_design_object : SET[1:?] OF change_management_object;
END_ENTITY;
(*

Attribute definitions:

current_design_object: the set of objects that have been added.

4.3.2 Change   

EXPRESS specification:

*)
ENTITY Change;
  id : OPTIONAL identifier;
  name : label;
  description : OPTIONAL text;
  described_change : OPTIONAL change_relationship_select;
END_ENTITY;
(*

Attribute definitions:

id: the identifier for the Change. The value of this attribute need not be specified.

name: the words by which the Change is known.

description: the text that provides further information about the Change. The value of this attribute need not be specified.

described_change: a relationship that identifies the previous group of objects and current group of objects. The value of this attribute need not be specified.

4.3.3 Change_element   

EXPRESS specification:

*)
ENTITY Change_element
  ABSTRACT SUPERTYPE OF (ONEOF (Modify_element,
                                Modify_single_element,
                                Delete_element,
                                Add_element));
  attribute_name : OPTIONAL STRING;
  change_location_in_aggregate_attribute : OPTIONAL LIST[1:?] OF INTEGER;
  change_set : Change;
END_ENTITY;
(*

Attribute definitions:

attribute_name: the attribute of the previous and current objects whose values are changed. The value of this attribute need not be specified.

change_location_in_aggregate_attribute: specifies the list of aggregate positions for the Change_element.

change_set: the Change to which this Change_element belongs to.

4.3.4 Change_element_sequence   

EXPRESS specification:

*)
ENTITY Change_element_sequence;
  description : OPTIONAL text;
  previous : Change_element;
  next : Change_element;
END_ENTITY;
(*

Attribute definitions:

description: the text that provides further information about the Change_element_sequence. The value of this attribute need not be specified.

previous: the previous Change_element.

next: the next Change_element.

4.3.5 Delete_element   

EXPRESS specification:

*)
ENTITY Delete_element
  SUBTYPE OF (Change_element);
  previous_design_object : SET[1:?] OF change_management_object;
END_ENTITY;
(*

Attribute definitions:

previous_design_object: the set of objects that have been deleted.

4.3.6 Frozen_assignment   

EXPRESS specification:

*)
ENTITY Frozen_assignment;
  frozen_item : SET[1:?] OF change_management_object;
END_ENTITY;
(*

Attribute definitions:

frozen_item: the objects that have been frozen.

4.3.7 Modify_element   

EXPRESS specification:

*)
ENTITY Modify_element
  SUBTYPE OF (Change_element);
  current_design_object : SET[1:?] OF change_management_object;
END_ENTITY;
(*

Attribute definitions:

current_design_object: the set of objects that have been modified.

4.3.8 Modify_single_element   

EXPRESS specification:

*)
ENTITY Modify_single_element
  SUBTYPE OF (Change_element);
  current_design_object : change_management_object;
  previous_design_object : change_management_object;
WHERE
  WR1: current_design_object <> previous_design_object;
END_ENTITY;
(*

Attribute definitions:

current_design_object: the current object that is modified or is the result of the modification.

previous_design_object: the previous object that has been modified.

Formal propositions:

WR1: The previous_design_object and current_design_object shall refer to different objects.

© ISO 2019 — All rights reserved