4 Information requirements

This clause specifies the information requirements for the Geometric model 2d 3D relationship 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 Geometric_model_2d_3d_relationship_arm schema and identifies the necessary external references.

4.1 Required AM ARMs

The following EXPRESS interface statements specify the elements imported from the ARMs of other application modules.

EXPRESS specification:

*)
USE FROM Contextual_shape_positioning_arm;    --  ISO/TS 10303-1027



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:

Contextual_shape_positioning_arm	ISO/TS 10303-1027
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.

4.2 ARM entity definitions

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.

4.2.1 Axis_placement_2d_3d_mapping   

An Axis_placement_2d_3d_mapping is a geometric transformation defined by a source Axis_placement_2d and a target Axis_placement_3d.

The transformation shall be computed as the following mapping:

• the location of the transform_item_1 onto the location of the target;
• the x-axis of the transform_item_1 onto the x-axis of the target;
• the y-axis of the transform_item_1 onto the y-axis of the target.

EXPRESS specification:

*)
ENTITY Axis_placement_2d_3d_mapping;
  transform_item_1 : Axis_placement_2d;
  transform_item_2 : Axis_placement_3d;
END_ENTITY;
(*

Attribute definitions:

transform_item_1: the Axis_placement_2d that plays the role of source in the transformation.

transform_item_2: the Axis_placement_3d that plays the role of target in the transformation.

4.2.2 Coordinated_geometric_relationship_with_2d_3d_placement_transformation   

EXPRESS specification:

*)
ENTITY Coordinated_geometric_relationship_with_2d_3d_placement_transformation
  SUBTYPE OF (Geometric_model_relationship_with_transformation);
  transformation : Axis_placement_2d_3d_mapping;
WHERE
  WR1: NOT('GEOMETRIC_MODEL_RELATIONSHIP_ARM.DEFINITIONAL_REPRESENTATION_RELATIONSHIP' IN TYPEOF(SELF));
END_ENTITY;
(*

Attribute definitions:

transformation: the Axis_placement_2d_3d_mapping that identifies the transformation for the Coordinated_geometric_relationship_with_2d_3d_placement_transformation.

Formal propositions:

WR1: A Coordinated_geometric_relationship_with_2d_3d_placement_transformation shall not be a Definitional_representation_relationship.

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