4 Information requirements

This clause specifies the information requirements for the Dimension and tolerance callouts 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 Dimension_and_tolerance_callouts_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 Appearance_assignment_arm;    --  ISO/TS 10303-1001



USE FROM Associative_draughting_elements_arm;    --  ISO/TS 10303-1311



USE FROM Associative_text_arm;    --  ISO/TS 10303-1132



USE FROM Basic_geometry_arm;    --  ISO/TS 10303-1652



USE FROM Draughting_annotation_arm;    --  ISO/TS 10303-1206



USE FROM Draughting_element_specialisations_arm;    --  ISO/TS 10303-1312



USE FROM Elemental_geometric_shape_arm;    --  ISO/TS 10303-1004



USE FROM Geometric_tolerance_arm;    --  ISO/TS 10303-1051



USE FROM Value_with_unit_arm;    --  ISO/TS 10303-1054
(*



NOTE 1   The schemas referenced above are specified in the following part of ISO 10303:

Appearance_assignment_arm	ISO/TS 10303-1001
Associative_draughting_elements_arm	ISO/TS 10303-1311
Associative_text_arm	ISO/TS 10303-1132
Basic_geometry_arm	ISO/TS 10303-1652
Draughting_annotation_arm	ISO/TS 10303-1206
Draughting_element_specialisations_arm	ISO/TS 10303-1312
Elemental_geometric_shape_arm	ISO/TS 10303-1004
Geometric_tolerance_arm	ISO/TS 10303-1051
Value_with_unit_arm	ISO/TS 10303-1054

NOTE 2   See Annex C, Figures C.1and C.2 for a graphical representation of this schema.

4.2 ARM type definitions

This subclause specifies the ARM types for this application module. The ARM types and definitions are specified below.

4.2.1 annotation_placeholder_occurrence_role   

EXPRESS specification:

*)
TYPE annotation_placeholder_occurrence_role = ENUMERATION OF
   (annotation_text,
    gps_data);
END_TYPE;
(*

Enumerated item definitions:

annotation_text: specifies the text of the annotation

gps_data: specifies the geometric elements in the collection

4.2.2 geometric_placeholder_set_select   

The geometric_placeholder_set_select type is an extensible list of alternate data types that allows for the designation of the data types Cartesian_point, Point_on_curve, Point_on_surface, Planar_box, Annotation_text, and Axis_placement.

NOTE   The list of entity data types may be extended in application modules that use the constructs of this module.

EXPRESS specification:

*)
TYPE geometric_placeholder_set_select = EXTENSIBLE GENERIC_ENTITY SELECT
   (Cartesian_point,
    Point_on_curve,
    Point_on_surface,
    Planar_box,
    Annotation_text,
    Axis_placement);
END_TYPE;
(*

4.2.3 datc_draughting_callout_content_select   

The datc_draughting_callout_content_select type is an extension of the draughting_callout_content_select type. It adds the data type Annotation_placeholder_occurrence to the list of alternate data types.

EXPRESS specification:

*)
TYPE datc_draughting_callout_content_select = SELECT BASED_ON draughting_callout_content_select WITH
   (Annotation_placeholder_occurrence);
END_TYPE;
(*

4.2.4 datc_draughting_model_item_definition   

The datc_draughting_model_item_definition type is an extension of the draughting_model_item_definition type. It adds the data types Assigned_property, Dimensional_location, Dimensional_size, and Geometric_tolerance to the list of alternate data types.

NOTE  The list of entity data types may be extended in application modules that use the constructs of this module.

EXPRESS specification:

*)
TYPE datc_draughting_model_item_definition = EXTENSIBLE GENERIC_ENTITY SELECT BASED_ON draughting_model_item_definition WITH
   (Assigned_property,
    Dimensional_location,
    Dimensional_size,
    Geometric_tolerance);
END_TYPE;
(*

4.3 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.

4.3.1 Annotation_placeholder_occurrence   

EXPRESS specification:

*)
ENTITY Annotation_placeholder_occurrence
  SUBTYPE OF (Annotation_element);
  SELF\styled_element.element : Geometric_placeholder_set;
  role : annotation_placeholder_occurrence_role;
  line_spacing : positive_length_measure;
INVERSE
  the_callout : draughting_callout FOR contents;
  the_draughting_model_item_association_with_placeholders : SET[0:1] OF draughting_model_item_association_with_placeholder FOR annotation_placeholder;
END_ENTITY;
(*

Attribute definitions:

element: geometric set that defines the geometric data elements for the placeholder occurrence.

role: specifies that the placeholder occurrence is for user defined text or is for geometric product specification purposes.

line_spacing: the vertical distance between the top of two consecutive lines of characters.

the_callout: specifies the draughting_callout that the annotation_placeholder_occurrence is dependent on.

the_draughting_model_item_association_with_placeholders: specifies the population constraint that says no more than one draughting_model_item_association_with_placeholder shall specify a particular occurrence.

Informal propositions:

IP1: The content of an Annotation_placeholder_occurrence shall be one axis placement, one or more point subtype instance, zero or one planar box, zero or one text.

IP2: IF the role is for geometric product specification purposes then there shall be a Draughting_model_item_association_with_placeholder provided.

IP3: IF the role is for geometric product specification purposes the name of the Representation_item supertype of the Geometric_placeholder_set specified by the attribute element shall be correlated with the type specified by the identified_item attribute of that Draughting_model_item_association_with_placeholder according to the following table:

Table 1 — Attribute Mapping

4.3.2 Associated_dimension_text   

EXPRESS specification:

*)
ENTITY Associated_dimension_text
  SUBTYPE OF (Dimension_text);
  is_displaying : Geometric_dimension;
END_ENTITY;
(*

Attribute definitions:

is_displaying: specifies the role of the Geometric_dimension for the Associated_dimension_text.

4.3.3 Dimension_curve_terminator_to_projection_curve_associativity   

EXPRESS specification:

*)
ENTITY Dimension_curve_terminator_to_projection_curve_associativity
  SUBTYPE OF (Annotation_occurrence_associativity);
  SELF\annotation_occurrence_associativity.relating_element : Dimension_curve_terminator;
  SELF\annotation_occurrence_associativity.related_element : Projection_curve;
END_ENTITY;
(*

Attribute definitions:

relating_element: an inherited attribute shall be of type Dimension_curve_terminator for the Dimension_curve_terminator_to_projection_curve_associativity.

related_element: an inherited attribute shall be of type Projection_curve for the Dimension_curve_terminator_to_projection_curve_associativity.

4.3.4 Draughting_model_item_association_with_placeholder   

EXPRESS specification:

*)
ENTITY Draughting_model_item_association_with_placeholder
  SUBTYPE OF (Draughting_model_item_association);
  SELF\draughting_model_item_association.identified_item : Draughting_callout;
  annotation_placeholder : Annotation_placeholder_occurrence;
END_ENTITY;
(*

Attribute definitions:

identified_item: specifies the draughting_callout that is the context for the placehoccurrence is a type of Annotation_element that provides older.

annotation_placeholder: specifies the placeholder object.

4.3.5 Geometric_placeholder_set   

EXPRESS specification:

*)
ENTITY Geometric_placeholder_set
  SUBTYPE OF (Detailed_geometric_model_element);
  elements : SET[1:?] OF geometric_placeholder_set_select;
END_ENTITY;
(*

Attribute definitions:

elements: specifies the elements in the collection.

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