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Application module:
Basic geometric topology |
ISO/TS 10303-1323:2021(E)
© ISO
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This clause specifies the information requirements for the
Basic geometric topology
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
Basic_geometric_topology_arm
schema and identifies the necessary external references.
EXPRESS specification:
*)
SCHEMA Basic_geometric_topology_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
Elemental_topology_arm;
--
ISO/TS 10303-1005
(*
NOTE 1
The schemas referenced above are specified in the following
part of ISO 10303:
| Basic_geometry_arm |
ISO/TS 10303-1652 |
| Elemental_topology_arm |
ISO/TS 10303-1005 |
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.
An Edge_curve is a type of
Detailed_geometric_model_element
and a type of
Edge
that has its geometry defined by a geometric curve.
EXPRESS specification:
*)
ENTITY Edge_curve
SUBTYPE OF (Detailed_geometric_model_element, Edge);
edge_geometry : Curve;
same_sense : BOOLEAN;
END_ENTITY;
(*
Attribute definitions:
edge_geometry:
the Curve
defining the geometric shape of the edge.
same_sense:
a BOOLEAN variable giving the relationship between the topological sense of the edge and the parametric sense of the curve.
A Face_surface is a type of
Detailed_geometric_model_element
and a type of
Face
that has its geometry defined by a geometric Surface.
NOTE 1
The full semantics of this entity is defined in the corresponding AIM object from ISO 10303-42; this has additional constraints
in the form of informal propositions.
EXPRESS specification:
*)
ENTITY Face_surface
SUBTYPE OF (Detailed_geometric_model_element, Face);
face_geometry : Surface;
same_sense : BOOLEAN;
END_ENTITY;
(*
Attribute definitions:
face_geometry:
the Surface
defining the geometric shape of the Face .
NOTE 2
The full semantics of this attribute is defined in the corresponding AIM object from ISO 10303-42;
the AIM entity an additional constraints to ensure that the face_geometry is not of type oriented_surface.
same_sense:
a BOOLEAN variable giving the relationship between the topological normal of the Face and the geometric normal to the surface.
A Poly_loop is a type of
Detailed_geometric_model_element
and a type of
Loop
with straight edges bounding a planar region in space. The poly loop is defined by a list of points that serve as vertices.
The poly loop is composed of straight line segments joining a point in the list to the
succeeding point in the list. The closing segment is from the last to the first point in the list.
The direction of the poly loop is in the direction of the line segments. Unlike the Edge_loop entity, the edges and vertices
of the Poly_loop are implicitly defined by the polygon points.
NOTE
The full semantics of this entity is defined in the corresponding AIM object from ISO 10303-42; this has additional constraints
in the form of informal propositions including a requirement that the defining points are coplanar.
EXPRESS specification:
*)
ENTITY Poly_loop
SUBTYPE OF (Detailed_geometric_model_element, Loop);
polygon : LIST[3:?] OF
UNIQUE
Cartesian_point;
END_ENTITY;
(*
Attribute definitions:
polygon:
a list of three (3) or more Cartesian_points
defining the loop. There are no repeated points in this list.
A Vertex_point is a type of
Detailed_geometric_model_element
and a type of
Vertex
that has its geometry location defined by a point in Cartesian space.
EXPRESS specification:
*)
ENTITY Vertex_point
SUBTYPE OF (Detailed_geometric_model_element, Vertex);
vertex_geometry : Point;
END_ENTITY;
(*
Attribute definitions:
vertex_geometry:
the geometric
Point
which defines the position in geometric space of the
Vertex.
*)
END_SCHEMA; -- Basic_geometric_topology_arm
(*
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