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Application module:
External model |
ISO/TS 10303-1033:2014-02(E)
© ISO
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This clause specifies the information requirements for the
External model
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
External_model_arm
schema and identifies the necessary external references.
EXPRESS specification:
*)
SCHEMA External_model_arm;
(*
The following EXPRESS interface statements specify the elements
imported from the ARMs of other application modules.
EXPRESS specification:
*)
USE FROM
Elemental_geometric_shape_arm;
--
ISO/TS 10303-1004
USE FROM
File_identification_arm;
--
ISO/TS 10303-1127
(*
NOTE 1
The schemas referenced above are specified in the following
part of ISO 10303:
| Elemental_geometric_shape_arm |
ISO/TS 10303-1004 |
| File_identification_arm |
ISO/TS 10303-1127 |
NOTE 2
See Annex C,
Figures
C.1and C.2
for a graphical representation of this schema.
This subclause specifies the ARM entity for this
module. The ARM entity is an atomic element that
embodies a unique application concept and contains attributes
specifying the data elements of the entity. The ARM
entity and definition is specified below.
An External_geometric_model is a type of 3D Geometric_model
whose content is provided in an external file.
The set of items of the External_geometric_model contains only one element that shall be an Axis_placement.
This Axis_placement
specifies the reference location and orientation with respect to which placement of the External_geometric_model in other Geometric_models shall be defined.
EXPRESS specification:
*)
ENTITY External_geometric_model
SUBTYPE OF (Geometric_model);
SELF\Representation.items : SET[1:1] OF Axis_placement;
external_file : Digital_file;
WHERE
WR1: SELF\Representation.context_of_items\Geometric_coordinate_space.dimension_count = 3;
WR2: SELF\Representation.context_of_items.kind = 'external';
END_ENTITY;
(*
Attribute definitions:
items:
the Axis_placement
that defines the reference position or orientation of the
External_geometric_model.
NOTE
Most of times, the position is the origin point of the coordinate space and the orientation matrix is the identity matrix.
external_file:
the Digital_file
that contains the external geometry information.
Formal propositions:
WR1:
the External_geometric_model shall be a 3D model.
WR2:
The Representation_context
of the External_geometric_model shall be of kind 'external'.
NOTE
Because the External_geometric_model entity is a subtype of Geometric_model, the Representation_context
of the External_geometric_model is actually a Geometric_coordinate_space.
*)
END_SCHEMA; -- External_model_arm
(*
© ISO 2014 — All rights reserved
