representing_geometric

NOTE The template has been defined in the context of the capability representing_properties_numerically 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.

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".

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

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

%^target = $representing_geometric_context.coordinate_space%

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

-- Instantiate Length_unit
Length_unit

-- Set the unused Length_unit name attribute to be ignored
Length_unit.name = '/IGNORE'

-- Set the used Length_unit si_unit attribute to the corresponding input parameter
Length_unit.si_unit = @si_length_unit

-- Assign reference data for Length_unit
/assigning_reference_data(
    items=Length_unit,
    class_name=@length_unit,
    ecl_id=@length_unit_ecl)/

-- Instantiate Plane_angle_unit
Plane_angle_unit

-- Set the unused Plane_angle_unit name attribute to be ignored
Plane_angle_unit.name = '/IGNORE'

-- Set the Plane_angle_unit si_unit attribute to "false"
Plane_angle_unit.si_unit = '.F.'

-- Assign reference data for Plane_angle_unit
/assigning_reference_data(
    items=Plane_angle_unit,
    class_name=@plane_angle_unit,
    ecl_id=@plane_angle_unit_ecl)/

-- Instantiate Geometric_coordinate_space
Geometric_coordinate_space

-- Bind the Geometric_coordinate_space to the parameter ^coordinate_space
%^coordinate_space = Geometric_coordinate_space%

-- Set the unused Geometric_coordinate_space.id attribute to be ignored
Geometric_coordinate_space.id = '/IGNORE'

-- Set the Geometric_coordinate_space.kind attribute to the default value for PLCS 'external'
-- since all geometry representations are external to PLCS
Geometric_coordinate_space.kind = 'external'

-- Set the used Geometric_coordinate_space attributes to the corresponding input parameters
Geometric_coordinate_space.dimension_count = @dimension_count

-- Instantiate the used Geometric_coordinate_space relationship
Geometric_coordinate_space.units -> Length_unit
Geometric_coordinate_space.units -> Plane_angle_unit

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

/representing_geometric_context(length_unit='Metre', length_unit_ecl='urn:plcs:rdl:std', plane_angle_unit='Radian', plane_angle_unit_ecl='urn:plcs:rdl:std', si_length_unit='true', dimension_count='3')/

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

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:

Entity in path	Value	Inherited from
Length_unit.name	'/IGNORE'	Unit.name
Length_unit.si_unit	@si_length_unit	Unit.si_unit
Plane_angle_unit.name	'/IGNORE'	Unit.name
Plane_angle_unit.si_unit	'.F.'	Unit.si_unit
Geometric_coordinate_space.id	'/IGNORE'	Representation_context.id
Geometric_coordinate_space.kind	'external'	Representation_context.kind
Geometric_coordinate_space.dimension_count	@dimension_count	—