Application module: External model | ISO/TS 10303-1033:2014-02(E) © ISO |
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.
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
(*
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