representing_assembly_relationship

Template:— representing_assembly_relationship_substitution (rep_assy_rel_subst)
Capability:representing_assembly_structure

Date: 2010/08/26 07:37:38
Revision: 1.1

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

This section specifies the template representing_assembly_relationship_substitution.

NOTE The template has been defined in the context of the capability representing_assembly_structure which provides an overall description of the relevant parts of the ISO 10303-239 information model and a description 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 that a the usage of one Product_version can be substituted by the usage of another Product_version in a specific assembly structure.

NOTE Both assembly relationships shall refer to the same Product_view_definition of the same assembly.

NOTE An Assembly_relationship_substitution defines a one-way substitution, i.e. if 'A' is specified as a substitute for 'B', 'B' is not implied to be a substitute for 'A'.

Model diagrams

The EXPRESS-G diagram in Figure 1 shows the templates and EXPRESS entities that are required to represent the template "representing_assembly_relationship_substitution". The text highlighted in blue shows the template parameters.

Figure 1 — An EXPRESS-G representation of the Information model for representing_assembly_relationship_substitution

The graphic for the template to be used in other EXPRESS-G diagrams is shown in Figure 2 below.

Figure 2 — The graphical representation of the representing_assembly_relationship_substitution template

Input parameters

The following input parameters are defined for this template:

base_rel (Type= 'ENTITY (Assembly_component_relationship)' )

The Assembly_component_relationship that may be substituted.

subst_rel (Type= 'ENTITY (Assembly_component_relationship)' )

The Assembly_component_relationship that may be used in place of the base_relationship (base_rel).

Reference parameters

The following reference parameters are defined for this template:

assy_rel_subst(Type='ENTITY (Assembly_relationship_substitution)')

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

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

%^target = $representing_assembly_relationship_substitution.assy_rel_subst%

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

Uniqueness constraints

The following parameter combinations specify a uniqueness constraint:

Unique constraint: Assembly relationship substitution

Each instance of the entity (Assembly_relationship_substitution) within the data set shall be uniquely identified by a combination of the following parameters on this template (representing_assembly_relationship_substitution) namely: base_rel, subst_rel.
The instance is referenced by the following template parameter: assy_rel_subst.

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.

Assembly_relationship_substitution

-- Mark the Assembly_relationship_substitution entity as
-- referable when this template is used by binding it to the reference
-- parameter assy_rel_subst
%^assy_rel_subst = Assembly_relationship_substitution%
Assembly_relationship_substitution.name = '/IGNORE'
Assembly_relationship_substitution.description = '/IGNORE'
Assembly_relationship_substitution.base_relationship -> @base_rel
Assembly_relationship_substitution.substitute_relationship -> @subst_rel

The following entities are instantiated with attributes as specified:

Entity in path	Value	Inherited from
Assembly_relationship_substitution.name	'/IGNORE'	—
Assembly_relationship_substitution.description	'/IGNORE'	—

Instance diagrams

The instance diagram in Figure 3 shows an example of the EXPRESS entities and templates that are instantiated by the template:

/representing_assembly_relationship_substitution(base_rel='#1', subst_rel='#2')/

(an illustration of the consolidated representing_assembly_relationship_substitution template is shown in Figure 4 below.)

Figure 3 — Entities instantiated by representing_assembly_relationship_substitution template

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


          #1 = PROMISSORY_USAGE('/IGNORE','/IGNORE','/IGNORE',$,$,$,'/IGNORE');
          #2 = PROMISSORY_USAGE('/IGNORE','/IGNORE','/IGNORE',$,$,$,'/IGNORE');
          #3 = ASSEMBLY_RELATIONSHIP_SUBSTITUTION('/IGNORE','/IGNORE',#1,#2);

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

The instance diagram in Figure 4 shows the graphic symbol for the template that is to be used in other instance diagrams. The example template is:

/representing_assembly_relationship_substitution(base_rel='#1', subst_rel='#2')/

Figure 4 — Instantiation of representing_assembly_relationship_substitution template

Characterizations

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