Template:— product_composition_position (prod_comp_pos)
Context:— UK_Defence

Date: 2010/07/16 11:51:36
Revision: 1.5

Cover Contents Description Bus. perspective Bus. obj.Model diags.Input params.Ref. params.Instantiation path Instance diags.Characterizations Issues in situ

This section specifies the template product_composition_position.

NOTE The template has been defined in the context of UK_Defence. Refer to the business context for details of related templates.

NOTE An explanation of a template and the associated instantiation path is provided in the Template overview section.

Description

This template describes how to represent the relationship between a parent / child relationship between two products and a parent / child relationship between two physical breakdown items. It uses Product_definition_element_relationship.

Business perspective

This Information Object represents the relationship of the parent / child relationship between two products and the parent / child relationship between two physical breakdown items. This is used to establish which position an actual product is installed in if there is more than one possibility. The intention is to record that the child product is installed as the child physical breakdown item, wrt to their respective parents.

EXAMPLE It is necessary to know which specific serial numbered engine is installed as the port auxilliary generator, and which is installed as the starboard auxilliary generator on a ship. Physical Item Relationship will define that a Type 45 destoyer can have port and starboard auxilliary generators. Product Composition will define that Cummins diesel engine serial numbers 123 and 456 are installed in HMS Daring. Product Compsition Position will define which serial numbered engine is installed as the port and which is installed as the starboard auxilliary generator.

Business object definition

Figure 1 — Graphical Representation for Business Object Product Composition Postion

Attribute name	Attribute description	Attribute type	Optionality
ID	This is the identifier of the product composition position.	Identifier	Mandatory
Physical Breakdown Item	This is the reference to the physical item relationship that defines the position of the child with respect to its parent in the related product composition relationship.	Physical Item Relationship	Mandatory
Product Composition	This is the reference to the parent / child product relationship whose position is defined by the related physical item relationship.	Product Composition	Mandatory

Table 1 — Product attribute details

Model diagrams

The EXPRESS-G diagram in Figure 2 shows the templates and EXPRESS entities that are required to represent the template "product_composition_position". The text highlighted in blue shows the template parameters.

Figure 2 — An EXPRESS-G representation of the Information model for product_composition_position

The graphic for the template to be used in other EXPRESS-G diagrams is shown in Figure 3 below.

Figure 3 — The graphical representation of the product_composition_position template

Input parameters

The following input parameters are defined for this template:

ID (Type='STRING')

The identifier of the product definition element relationship.

ID_source_organization (Type='STRING')

The identifier of the product definition element relationship.

product (Type= 'SELECT (product_item)' )

This is the reference to the product composition.

breakdown (Type= 'SELECT (breakdown_item)' )

This is the reference to the physical item relationship.

Reference parameters

The following reference parameters are defined for this template:

prod_def_elm_rel(Type='ENTITY (Product_definition_element_relationship)')

Allow the Product_definition_element_relationship entity instantiated in this path to be referenced when this template is used.

Note: The Product_definition_element_relationship entity can be referenced in a template path by:

%^target = $product_composition_position.prod_def_elm_rel%

where target is the parameter to which the Product_definition_element_relationship is bound.

Uniqueness constraints

The following parameter combinations specify a uniqueness constraint:

Unique constraint: Unique id

Each instance of the entity (Product_definition_element_relationship) within the data set shall be uniquely identified by a combination of the following parameters on this template (product_composition_position) namely: ID, ID_source_organization.
The instance is referenced by the following template parameter: prod_def_elm_rel.

Instantiation path

The instantiation path shown below specifies the entities that are to be instantiated by the template.

A description of templates and the syntax for the instantiation path is provided in the Templates Help/Information section.

-- Product_definition_element_relationship
Product_definition_element_relationship
%^prod_def_elm_rel = Product_definition_element_relationship%
Product_definition_element_relationship.id = '/IGNORE'
Product_definition_element_relationship.name = '/IGNORE'
Product_definition_element_relationship.product -> @product
Product_definition_element_relationship.breakdown -> @breakdown

-- Identifier
/identifier(
    ID=@ID,
    source_organization=@ID_source_organization,
    type='identification_code',
    items=^prod_def_elm_rel)/

The following entities are instantiated with attributes as specified:

Entity in path	Value	Inherited from
Product_definition_element_relationship.id	'/IGNORE'	—
Product_definition_element_relationship.name	'/IGNORE'	—

Instance diagrams

The instance diagram in Figure 4 shows an example of the EXPRESS entities and templates that are instantiated by the template:

/product_composition_position(items='#1', class_name='Safety_critical', ecl_id='urn:plcs:rdl:std')/

(an illustration of the consolidated product_composition_position template is shown in Figure 5 below.)

Figure 4 — Entities instantiated by product_composition_position template

The instance model in STEP ASCII exchange file format (ISO 10303 Part 21 syntax) is:


          #1 = TASK_METHOD($,$,$,$,());
          #2 = EXTERNAL_CLASS('/IGNORE','Safety_critical',$,#3);
          #3 = EXTERNAL_CLASS_LIBRARY('urn:plcs:rdl:std',$);
          #4 = CLASSIFICATION_ASSIGNMENT(#2,(#1),'/IGNORE');

The instance model in STEP XML exchange file format (ISO 10303 Part 28 ed.2 syntax) is:

The instance diagram in Figure 5 shows the graphic symbol for the template that is to be used in other instance diagrams. The example template is:

/product_composition_position(items='#1', class_name='Safety_critical', ecl_id='urn:plcs:rdl:std')/

Figure 5 — Instantiation of product_composition_position template

Characterizations

No common characterizations of the template product_composition_position have been identified. However, the ISO 10303-239 EXPRESS model may enable other assignments to the entities instantiated by the template.