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Application module:
Extended basic geometry |
ISO/TS 10303-1667:2014-02(E)
© ISO
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This clause specifies the information requirements for the
Extended basic geometry
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
Extended_basic_geometry_arm
schema and identifies the necessary external references.
EXPRESS specification:
*)
SCHEMA Extended_basic_geometry_arm;
(*
The following EXPRESS interface statements specify the elements
imported from the ARMs of other application modules.
EXPRESS specification:
*)
USE FROM
Basic_geometry_arm;
--
ISO/TS 10303-1652
USE FROM
Geometric_model_relationship_arm;
--
ISO/TS 10303-1403
(*
NOTE 1
The schemas referenced above are specified in the following
part of ISO 10303:
| Basic_geometry_arm |
ISO/TS 10303-1652 |
| Geometric_model_relationship_arm |
ISO/TS 10303-1403 |
NOTE 2
See Annex C,
Figures
C.1and C.2
for a graphical representation of this schema.
This subclause specifies the ARM entities for this
module. Each ARM application entity is an atomic element that
embodies a unique application concept and contains attributes
specifying the data elements of the entity. The ARM
entities and definitions are specified below.
A Detailed_geometric_model_element_relationship is the association between a
Detailed_geometric_model_element
and another
Detailed_geometric_model_element
for predefined purposes.
The purpose shall be specified in the Application Object that references a Detailed_geometric_model_element_relationship.
EXPRESS specification:
*)
ENTITY Detailed_geometric_model_element_relationship;
item_1 : Detailed_geometric_model_element;
item_2 : Detailed_geometric_model_element;
WHERE
WR1: item_1 <> item_2;
END_ENTITY;
(*
Attribute definitions:
item_1:
specifies one role of the
Detailed_geometric_model_element
for the Detailed_geometric_model_element_relationship.
item_2:
specifies one role of the
Detailed_geometric_model_element
for the Detailed_geometric_model_element_relationship.
Formal propositions:
WR1:
The item_1 and item_2 shall not be the same
Detailed_geometric_model_element.
A Geometric_model_element_relationship is a type of
Detailed_geometric_model_element_relationship
and a type of
Detailed_geometric_model_element.
EXPRESS specification:
*)
ENTITY Geometric_model_element_relationship
SUBTYPE OF (Detailed_geometric_model_element_relationship, Detailed_geometric_model_element);
END_ENTITY;
(*
A Vector is a type of
Detailed_geometric_model_element.
A Vector is a quantity that has magnitude and direction and that is commonly represented by a directed line
segment whose length represents the magnitude and whose orientation in space represents the direction.
EXPRESS specification:
*)
ENTITY Vector
SUBTYPE OF (Detailed_geometric_model_element);
orientation : Direction;
magnitude : length_measure;
WHERE
WR1: magnitude >= 0.0;
END_ENTITY;
(*
Attribute definitions:
orientation:
specifies the role of
Direction
for the Vector.
magnitude:
specifies the role of
length_measure
for the Vector.
Formal propositions:
WR1:
The magnitude of the Vector should be equal or greater than zero.
This subclause specifies the ARM subtype constraint for
this module. The subtype constraint places a constraint on the
possible super-type / subtype instantiations.
The ARM subtype constraint and definition is
specified below.
The
alternate_extended_geometry_items
constraint specifies a constraint that applies to instances of subtypes of
Detailed_geometric_model_element.
EXPRESS specification:
*)
SUBTYPE_CONSTRAINT alternate_extended_geometry_items FOR Detailed_geometric_model_element;
ONEOF (Direction,
Axis_placement,
Cartesian_transformation_2d,
Cartesian_transformation_3d,
Curve,
Geometric_model_element_relationship,
Surface,
Vector);
END_SUBTYPE_CONSTRAINT;
(*
*)
END_SCHEMA; -- Extended_basic_geometry_arm
(*
© ISO 2014 — All rights reserved
