independent_property

Template:— independent_property_limit (indpt_prp_limit)

Date: 2009/04/27 13:25:29
Revision: 1.13

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

This section specifies the template independent_property_limit.

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 a numerical value with limit for an independent property.

Model diagrams

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

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

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 independent_property_limit template

Input parameters

The following input parameters are defined for this template:

limit (Type= 'TYPE (any_number_value)' )

The value of the property. The datatype is always 'any_number_value' and should not be registered together with the value, i.e. enter the value as a number, without datatype.

qualifier (Type= 'ENUMERATION (limit_qualifier_list)' )

The limit qualifier of the property. Allowed values are 'maximum' or 'minimum'

unit (Type='CLASS')

The name of the unit in which the value is expressed, referenced through an External_class.

The following classes and their sub-classes can be used:

classifications: "Unit" (urn:plcs:rdl:std:Unit)

unit_ecl_id (Default=urn:plcs:rdl:std,Type='URN')

The identifier of the External_class_library storing the definition of the unit name referenced by the parameter @unit.

si_unit (Type='BOOLEAN')

Value should be set to true if the unit is a SI base unit defined by ISO, i.e. kilogram (kg) for Mass, second (s) for Time, metre (m) for Displacement, ampere (A) for Electrical current, kelvin (K) for Temperature, mole (mol) for Amount of substance, and candela (cd) for Luminous intensity. If this is not the case it should be set to false.
Note that the representation of true and false depends on exchange format. In Part 11 (a STEP file) true is represented by the string ".T.", and false by ".F.", while in Part 28 (XML) they are represented by text strings "true" and "false".

context (Default=Numerical_representation_context,Type='CLASS')

The name of the class being used to classify the Representation_context of the property.

The following classes and their sub-classes can be used:

classifications: "Representation_context" (urn:plcs:rdl:std:Representation_context)

context_ecl_id (Default=urn:plcs:rdl:std,Type='URN')

The identifier of the External_class_library storing the definition of the class referenced by the parameter @context.

property (Type= 'ENTITY (Independent_property)' )

The target of the template, i.e. the Independent_property (or template representing_independent_property) to which the Independent_property_representation is related.

Reference parameters

The following reference parameters are defined for this template:

prop_repr(Type='ENTITY (Independent_property_representation)')

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

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

%^target = $independent_property_limit.prop_repr%

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

representation(Type='ENTITY (Property_value_representation)')

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

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

%^target = $independent_property_limit.representation%

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

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.

-- Instantiate Independent_property_representation entity
Independent_property_representation

-- Bind the Independent_property_representation entity to reference parameter ^prop_repr
%^prop_repr = Independent_property_representation%

-- Set the Independent_property_representation attributes role and description to be ignored
Independent_property_representation.role = '/IGNORE'
Independent_property_representation.description = '/IGNORE'

-- Instantiate template representing_value_limit
/representing_value_limit(
    limit=@limit,
    qualifier=@qualifier,
    unit=@unit,
    unit_ecl_id=@unit_ecl_id,
    si_unit=@si_unit,
    context=@context,
    context_ecl_id=@context_ecl_id)/

-- Bind the Independent_property_representation entity instantiated in the template representing_value_limit
-- to ^representation in this template and assign Independent_property_representation.rep to it
%^representation = $representing_value_limit.representation%
^prop_repr.rep -> ^representation

-- Assign value with limit to property
^prop_repr.property -> @property

The following entities are instantiated with attributes as specified:

Entity in path	Value	Inherited from
Independent_property_representation.role	'/IGNORE'	—
Independent_property_representation.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:

/independent_property_limit(limit='any_number_value(200)', qualifier='maximum', unit='Hour', unit_ecl_id='urn:plcs:rdl:std', si_unit='false', context='Bike Ltd ILS Database', context_ecl_id='urn:plcs:rdl:sample', property='#20')/

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

NOTE The instance #20 shown above is the Independent_property instantiated by the template representing_independent_property

Figure 3 — Entities instantiated by independent_property_limit template

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:

NOTE The instance #20 shown above is the Independent_property instantiated by the template representing_independent_property

Figure 4 — Instantiation of independent_property_limit template

Characterizations

The following section details how the independent_property_limit template can be optionally characterized by assigning other constructs to it. These are characterizations commonly applied to the template. The ISO 10303-239 EXPRESS model may enable other assignments to the entities instantiated by the template.

The following characterizations may apply:

Characterization Effectivity

NOTE this characterization is optional.

A property value for a defined property might just be effective under specific conditions. Effectivity is represented by assigning an effectivity to the Independent_property_representation using the assigning_effectivity template.

AP239 Issue (GYL-5)

The ISO-10303-239 1st edition does not support the assignment of Effectivity_assignment to an Independent_property_representation.

This has been raised as issue, GYL-5, against ISO 10303-239. The EXPRESS schema has been modified in DEXlib (Long form: dexlib/data/schemas/ap239_arm_lf.exp, short form: dexlib/data/schemas/ap239_arm_sf.exp). These changes will be made to ISO 10303-239 as a Technical Corrigendum at some stage.