4 Information requirements

This clause specifies the information requirements for the Dimension tolerance 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_tolerance_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 Activity_arm;    --  ISO/TS 10303-1047



USE FROM Derived_shape_element_arm;    --  ISO/TS 10303-1130



USE FROM Document_assignment_arm;    --  ISO/TS 10303-1122



USE FROM Extended_measure_representation_arm;    --  ISO/TS 10303-1106



USE FROM Value_with_unit_extension_arm;    --  ISO/TS 10303-1753
(*



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

Activity_arm	ISO/TS 10303-1047
Derived_shape_element_arm	ISO/TS 10303-1130
Document_assignment_arm	ISO/TS 10303-1122
Extended_measure_representation_arm	ISO/TS 10303-1106
Value_with_unit_extension_arm	ISO/TS 10303-1753

NOTE 2   See Annex C, Figures C.1, C.2and C.3 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 adjoining_or_centred   

EXPRESS specification:

*)
TYPE adjoining_or_centred = ENUMERATION OF
   (adjoining,
    centred);
END_TYPE;
(*

Enumerated item definitions:

adjoining: the radius is located by its end points;

centred: the radius is located by its centre.

4.2.2 angle_relator   

The angle_relator type is an identification of an angle. This angle is one of a set of angles created by:

• the intersection of two Shape_elements;
• the virtual intersection formed by extensions of two Shape_elements;
• the boundaries of a single angular Shape_element.

EXPRESS specification:

*)
TYPE angle_relator = ENUMERATION OF
   (equal,
    large,
    small);
END_TYPE;
(*

Enumerated item definitions:

equal: the numerical measure of the angles is equal at the point of intersection between two Shape_elements;

large: the numerical measure of the selected angle at the point of intersection between two Shape_elements is the larger absolute value;

small: the numerical measure of the selected angle at the point of intersection between two Shape_elements is the smaller absolute value.

EXAMPLE    Figure 1 illustrates a type of single angular Shape_element. See figure 2 for types of intersections of Shape_elements.

4.2.3 diameter_qualifier_enumeration   

EXPRESS specification:

*)
TYPE diameter_qualifier_enumeration = ENUMERATION OF
   (centre_outer,
    centre_inner,
    outer_centre,
    outer_outer,
    outer_inner,
    inner_centre,
    inner_outer,
    inner_inner);
END_TYPE;
(*

Enumerated item definitions:

centre_outer: specifies that for the relating Shape_element the centre shall be used and for the related Shape_element the outer boundary shall be used.

centre_inner: specifies that for the relating Shape_element the centre shall be used and for the related Shape_element the inner boundary shall be used.

outer_centre: specifies that for the relating Shape_element the outer boundary shall be used and for the related Shape_element the centre shall be used.

outer_outer: specifies that for the relating Shape_element the outer boundary shall be used and for the related Shape_element the outer boundary shall be used.

outer_inner: specifies that for the relating Shape_element the outer boundary shall be used and for the related Shape_element the inner boundary shall be used.

inner_centre: specifies that for the relating Shape_element the inner boundary shall be used and for the related Shape_element the centre shall be used.

inner_outer: specifies that for the relating Shape_element the inner boundary shall be used and for the related Shape_element the outer boundary shall be used.

inner_inner: specifies that for the relating Shape_element the inner boundary shall be used and for the related Shape_element the inner boundary shall be used.

4.2.4 diameter_type   

EXPRESS specification:

*)
TYPE diameter_type = ENUMERATION OF
   (circular_or_cylindrical_diameter,
    spherical_diameter,
    toroidal_minor_diameter,
    toroidal_major_diameter,
    toroidal_high_major_diameter,
    toroidal_low_major_diameter);
END_TYPE;
(*

Enumerated item definitions:

circular_or_cylindrical_diameter: the diameter of a circle or cylinder;

spherical_diameter: the diameter of a sphere;

toroidal_minor_diameter: the minor diameter of a torus;

toroidal_major_diameter: the major diameter of a torus;

toroidal_high_major_diameter: the high major diameter of a torus, also known as the outside diameter;

toroidal_low_major_diameter: the low major diameter of a torus, also known as the inside diameter.

4.2.5 dimension_target   

The dimension_target type is an extensible list of alternate data types. Additional alternate data types are specified in select data types that extend the dimension_target type.

NOTE   This empty extensible select requires extension in a further module to ensure that entities that refer to it have at least one valid instantiation.

EXPRESS specification:

*)
TYPE dimension_target = EXTENSIBLE GENERIC_ENTITY SELECT;
END_TYPE;
(*

4.2.6 dimension_value_select   

The dimension_value_select type allows for the designation of the data types Dimension_value_with_limitation, Numerical_item_with_unit, Tolerance_range, and Value_limit.

EXPRESS specification:

*)
TYPE dimension_value_select = SELECT
   (Dimension_value_with_limitation,
    Numerical_item_with_unit,
    Tolerance_range,
    Value_limit);
END_TYPE;
(*

4.2.7 dt_activity_item   

The dt_activity_item type is an extension of the activity_item type. It adds the data types Dimensional_size and Dimensional_location to the list of alternate data types.

EXPRESS specification:

*)
TYPE dt_activity_item = SELECT BASED_ON activity_item WITH
   (Dimensional_size,
    Dimensional_location);
END_TYPE;
(*

4.2.8 edge_of_undefined_shape_size_element   

The edge_of_undefined_shape_size_element type is an extensible list of alternate data types. Additional alternate data types are specified in select data types that extend the edge_of_undefined_shape_size_element type.

NOTE   This empty extensible select requires extension in a further module to ensure that entities that refer to it have at least one valid instantiation.

EXPRESS specification:

*)
TYPE edge_of_undefined_shape_size_element = EXTENSIBLE GENERIC_ENTITY SELECT;
END_TYPE;
(*

4.2.9 geometric_dimension_modifier   

EXPRESS specification:

*)
TYPE geometric_dimension_modifier = EXTENSIBLE ENUMERATION OF
   (two_point_size,
    local_size_defined_by_a_sphere,
    least_square_association_criteria,
    maximum_inscribed_association_criteria,
    minimum_circumscribed_association_criteria,
    circumference_diameter_calculated_size,
    area_diameter_calculated_size,
    volume_diameter_calculated_size,
    maximum_rank_order_size,
    minimum_rank_order_size,
    average_rank_order_size,
    median_rank_order_size,
    mid_range_rank_order_size,
    range_rank_order_size,
    any_part_of_the_feature,
    any_cross_section,
    specific_fixed_cross_section,
    common_tolerance,
    free_state_condition,
    statistical,
    continuous_feature,
    square,
    controlled_radius,
    united_feature_of_size);
END_TYPE;
(*

Enumerated item definitions:

two_point_size: the modifier symbol is two-point size - LP;

local_size_defined_by_a_sphere: the modifier symbol is local size defined by a sphere - LS;

least_square_association_criteria: the modifier symbol is least-square association criteria - GG;

maximum_inscribed_association_criteria: the modifier symbol is maximum inscribed association criteria - GX;

minimum_circumscribed_association_criteria: the modifier symbol is minimum circumscribed association criteria - GN;

circumference_diameter_calculated_size: the modifier symbol is circumference diameter (Calculated size) - CC;

area_diameter_calculated_size: the modifier symbol is area diameter (Calculated size) - CA;

volume_diameter_calculated_size: the modifier symbol is volume diameter (Calculated size) - CV;

maximum_rank_order_size: the modifier symbol is maximum (rank order ) size - SX;

minimum_rank_order_size: the modifier symbol is minimum (rank order ) size - SN;

average_rank_order_size: the modifier symbol is average (rank order ) size - SA;

median_rank_order_size: the modifier symbol is median (rank order) size - SM;

mid_range_rank_order_size: the modifier symbol is mid-range (rank order) size - SD;

range_rank_order_size: the modifier symbol is range (rank order) size - SR;

any_part_of_the_feature: the modifier symbol is any part of the feature - APF;

any_cross_section: the modifier symbol is any cross section - ACS;

specific_fixed_cross_section: the modifier symbol is specific fixed cross section - SCS;

common_tolerance: the modifier symbol is common tolerance - CT;

free_state_condition: the modifier symbol is free-state condition - Ⓕ;

statistical: the modifier symbol is statistical - <ST>;

NOTE 1   The symbol is used in ASME Y14.5-2009.

continuous_feature: the modifier symbol is continuous Feature - <CF>;

NOTE 2   The symbol is used in ASME Y14.5-2009.

square: the modifier symbol is square (square symbol);

NOTE 3   The symbol is used in ASME Y14.5-2009.

controlled_radius: the modifier symbol is controlled radius - CR;

NOTE 4   The symbol is used in ASME Y14.5-2009.

united_feature_of_size: the modifier symbol is united feature of size - UF.

4.2.10 limitation_definition_select   

The limitation_definition_select type allows for the designation of the data types Limits_and_fits and Plus_minus_bounds.

EXPRESS specification:

*)
TYPE limitation_definition_select = SELECT
   (Limits_and_fits,
    Plus_minus_bounds);
END_TYPE;
(*

4.2.11 radial_type   

EXPRESS specification:

*)
TYPE radial_type = ENUMERATION OF
   (circular_or_cylindrical_radius,
    spherical_radius,
    toroidal_minor_radius,
    toroidal_major_radius,
    toroidal_high_major_radius,
    toroidal_low_major_radius);
END_TYPE;
(*

Enumerated item definitions:

circular_or_cylindrical_radius: the radius of a circle or cylinder;

spherical_radius: the radius of a sphere;

toroidal_minor_radius: the minor radius of a torus;

toroidal_major_radius: the major radius of a torus;

toroidal_high_major_radius: the high major radius of a torus, also known as the outside radius;

toroidal_low_major_radius: the low major radius of a torus, also known as the inside radius.

4.2.12 tolerance_principle_type   

EXPRESS specification:

*)
TYPE tolerance_principle_type = ENUMERATION OF
   (envelope_requirement,
    independency,
    default);
END_TYPE;
(*

Enumerated item definitions:

envelope_requirement: the tolerance principle is envelope requirement;

independency: the tolerance principle is independency requirement;

default: the tolerance principle is an empty string.

4.2.13 undefined_edge_shape_enumeration_direction   

EXPRESS specification:

*)
TYPE undefined_edge_shape_enumeration_direction = ENUMERATION OF
   (true_neighbor,
    false_neighbor,
    both_neighbors);
END_TYPE;
(*

Enumerated item definitions:

true_neighbor: the neighbouring surface that includes the Oriented_edge with the .TRUE. orientation is affected.

false_neighbor: the neighbouring surface that includes the Oriented_edge with the .FALSE. orientation is affected.

both_neighbors: both neighbouring surfaces are affected.

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 Angle_plus_minus_bounds   

EXPRESS specification:

*)
ENTITY Angle_plus_minus_bounds
  SUBTYPE OF (Plus_minus_bounds);
  SELF\Plus_minus_bounds.lower_bound : Angle_data_element;
  SELF\Plus_minus_bounds.upper_bound : Angle_data_element;
END_ENTITY;
(*

Attribute definitions:

lower_bound: an attribute inherited from the Plus_minus_bounds in which the lower_bound is an Angle_data_element.

upper_bound: an attribute inherited from the Plus_minus_bounds in which the upper_bound is an Angle_data_element.

4.3.2 Angular_location   

An Angular_location is a type of Dimensional_location. An Angular_location specifies that a spatial constraint exists between two Shape_elements that intersect or would intersect if projected. An Angular_location is a measure of the angle defined by the two Shape_elements and their common intersection or projected intersection.

NOTE    The application and use of an Angular_location is illustrated in Figure 2. Figure 2 also illustrates types of intersection of two Shape_elements (a and b) and virtual intersection formed by Derived_shape_elements (c and d).

EXPRESS specification:

*)
ENTITY Angular_location
  SUBTYPE OF (Dimensional_location);
  angle_selection : angle_relator;
  orientation : OPTIONAL Axis_placement;
END_ENTITY;
(*

Attribute definitions:

angle_selection: an indication of the specific angle type at the point of intersection.

orientation: an axis placement establishing the direction of positive measure of the Angular_location. The angle extends in the XY plane from the X axis towards Y, about the origin. The value of this attribute need not be specified.

4.3.3 Angular_size   

NOTE    Figure 3 illustrates the Angular_size.

EXPRESS specification:

*)
ENTITY Angular_size
  SUBTYPE OF (Dimensional_size);
  full : BOOLEAN;
  angle_selection : angle_relator;
END_ENTITY;
(*

Attribute definitions:

full: specifies the Boolean value. A value of true specifies the angle is established between the two sides of an angular element. A value of false specifies the angle is established between a centre line datum and an angular element.

angle_selection: an indication of the specific type of angle at the point of intersection.

4.3.4 Curved_distance   

EXPRESS specification:

*)
ENTITY Curved_distance
  SUBTYPE OF (Dimensional_location);
  used_path : Measurement_path;
END_ENTITY;
(*

Attribute definitions:

used_path: the curve that represents the arc whose length is represented by the Curved_distance.

4.3.5 Curved_size   

EXPRESS specification:

*)
ENTITY Curved_size
  SUBTYPE OF (Dimensional_size);
END_ENTITY;
(*

4.3.6 Diameter_size   

EXPRESS specification:

*)
ENTITY Diameter_size
  SUBTYPE OF (Dimensional_size);
  geometry_type : diameter_type;
END_ENTITY;
(*

Attribute definitions:

geometry_type: the kind of diameter.

4.3.7 Dimension_value_with_limitation   

EXPRESS specification:

*)
ENTITY Dimension_value_with_limitation;
  defined_by : limitation_definition_select;
  limited_value : Numerical_item_with_unit;
END_ENTITY;
(*

Attribute definitions:

defined_by: the specification of the tolerance range. The range is defined_by either a Plus_minus_bounds, or by a reference to a system of limits and fits for the nominal value.

limited_value: the value that is limited.

4.3.8 Dimensional_location   

NOTE 1   Representation of a Shape_element participating in the Dimensional_location relationship implies a measuring direction for the Dimensional_location through the related and relating Shape_element. The meaning of the direction is specified in an application protocol.

NOTE 2   The application and use of Dimensional_location and Dimensional_size are shown in figure 4.

EXAMPLE 1   The short edge of a plate is located 90 degrees relative to the long edge.

EXAMPLE 2   The centre of the hole is 10 centimetres from the short edge.

EXPRESS specification:

*)
ENTITY Dimensional_location
  ABSTRACT SUPERTYPE OF (ONEOF (Angular_location,
                                Curved_distance,
                                Linear_distance))
  SUBTYPE OF (Geometric_dimension);
  description : OPTIONAL STRING;
  directed : OPTIONAL BOOLEAN;
  origin : dimension_target;
  target : dimension_target;
END_ENTITY;
(*

Attribute definitions:

description: the text that provides further information about the Dimensional_location. The value of this attribute need not be specified.

directed: a Boolean value designating the importance of direction for measuring a Dimensional_location. If the value is 'true' the Dimensional_location is measured from origin to target. A value of 'false' indicates that the direction for measuring the Dimensional_location is inconsequential. The value of this attribute need not be specified.

origin: the element that is the origin for the Dimensional_location.

target: the element that is the target for the Dimensional_location.

4.3.9 Dimensional_size   

EXAMPLE 1   The diameter of a hole is 2 centimetres.

NOTE 1   Dimensional_size as defined in this part of ISO 10303 describe an intrinsic length or angle characteristic of part shape. This includes characteristics of what are traditionally called "features-of-size", but they are not limited to that usage alone. For example, the Radial_size and Curved_size application objects describe characteristics which may not be applied to "features-of-size".

EXPRESS specification:

*)
ENTITY Dimensional_size
  ABSTRACT SUPERTYPE OF (ONEOF (Angular_size,
                                Curved_size,
                                Diameter_size,
                                Edge_of_undefined_shape_size,
                                Machining_feature_size,
                                Radial_size,
                                Thickness_size))
  SUBTYPE OF (Geometric_dimension);
  is_applied_to : dimension_target;
END_ENTITY;
(*

Attribute definitions:

is_applied_to: the Shape_element to which the Dimensional_size is applied.

4.3.10 Edge_of_undefined_shape_size   

EXPRESS specification:

*)
ENTITY Edge_of_undefined_shape_size
  SUBTYPE OF (Dimensional_size);
  orientation : undefined_edge_shape_enumeration_direction;
  SELF\Dimensional_size.is_applied_to : edge_of_undefined_shape_size_element;
  SELF\Geometric_dimension.dimension_value : Tolerance_range;
UNIQUE
  UR1: is_applied_to, orientation;
END_ENTITY;
(*

Attribute definitions:

orientation: specifies which neighbouring surface of the edge is affected.

is_applied_to: specifies the affected geometric edge object.

dimension_value: specifies the value as a Tolerance_range.

EXAMPLE    A part has several edges with undefined shapes as indicated below:

• an annotation of "-0,3" is represented with a lower_range value of -0.3 and an upper_range value of 0;
• an annotation of "+0,02" is represented with a lower_range value of 0 and an upper_range value of +0,02;
• an annotation of "+1/+0,5" is represented with a lower_range value of +0,5 and an upper_range value of +1;
• an annotation of "+1/-0,5" is represented with a lower_range value of -0.5 and an upper_range value of +1;
• an annotation of "-1/-2,5" is represented with a lower_range value of -2,5 and an upper_range value of -1;
• an annotation of "+/-0,05" is represented with a lower_range value of -0.05 and an upper_range value of +0,05.

Formal propositions:

UR1: A geometric edge object shall not have more than one Edge_of_undefined_shape_size for an orientation.

4.3.11 Geometric_dimension   

EXPRESS specification:

*)
ENTITY Geometric_dimension
  ABSTRACT SUPERTYPE OF (ONEOF (Dimensional_location,
                                Dimensional_size));
  id : STRING;
  dimension_value : dimension_value_select;
  notes : SET[0:?] OF STRING;
  theoretical_exact : BOOLEAN;
  auxiliary : BOOLEAN;
  tolerance_principle : tolerance_principle_type;
  modifiers : LIST[0:?] OF geometric_dimension_modifier;
  unit_length : OPTIONAL Length_data_element;
END_ENTITY;
(*

Attribute definitions:

id: the identifier of the Geometric_dimension.

dimension_value: the value of size of the element or of the distance between the two elements.

notes: the set of instances of text that provide additional information about the Geometric_dimension.

theoretical_exact: a Boolean value that specifies whether the dimension value is theoretically exact or not. A value of 'true' indicates that this size dimension is theoretically exact.

auxiliary: a Boolean value that specifies whether the dimension value is for information purposes only or not. A value of 'true' indicates that this dimension is for information purposes only.

tolerance_principle: specifies the role of the tolerance_principle_type for the Geometric_dimension.

modifiers: specifies the role of the geometric_dimension_modifier for the Geometric_dimension. There shall exist zero or more geometric_dimension_modifiers for the Geometric_dimension.

unit_length: specifies the role of the Length_data_element for the Geometric_dimension. The value of this attribute need not be specified.

4.3.12 Length_plus_minus_bounds   

EXPRESS specification:

*)
ENTITY Length_plus_minus_bounds
  SUBTYPE OF (Plus_minus_bounds);
  SELF\Plus_minus_bounds.lower_bound : Length_data_element;
  SELF\Plus_minus_bounds.upper_bound : Length_data_element;
END_ENTITY;
(*

Attribute definitions:

lower_bound: an attribute inherited from the Plus_minus_bounds in which the lower_bound is a Length_data_element.

upper_bound: an attribute inherited from the Plus_minus_bounds in which the upper_bound is a Length_data_element.

4.3.13 Limits_and_fits   

A Limits_and_fits is a tolerance specified by reference to the limits-and-fits system standardized by ISO 286. The application of Limits_and_fits shall conform to the requirements of ISO 286. Limits and fits is a system for assigning tolerances associated with the assembly of mating product features.

EXAMPLE 1   A hole and a shaft that are intended to mate in an assembly.

In limits-and-fits system, a tolerance is assigned to a feature of size by classification rather than by giving an explicit value. A tolerance classification is composed of a fundamental deviation or "position letter" and a tolerance grade. These are used to calculate the size of the tolerance zone and its location relative to the basic or nominal size of the feature according to the tables and formulas found in ISO 286.

EXPRESS specification:

*)
ENTITY Limits_and_fits;
  deviation : STRING;
  fitting_type : OPTIONAL STRING;
  grade : STRING;
END_ENTITY;
(*

Attribute definitions:

deviation: a representation of the fundamental deviation or "position letter" of the ISO 286 limits-and-fits tolerance classification. Only symbols defined in ISO 286 shall be provided.

NOTE 1   The symbols 'A' to 'ZC' for holes or 'a' to 'zc' for shafts may be used to classify deviation.

fitting_type: the kind of fitting to which the tolerance applies. Normally the tolerance applies to an external or internal feature of the workpiece. Where applicable the following values shall be used:

• "hole": the tolerance applies to an internal feature of the workpiece;
• "shaft": the tolerance applies to an external feature of the workpiece.

NOTE 2   Whether the tolerance applies to an interior or exterior feature can be determined from the position letter of the fundamental deviation, therefore fitting_type need not be specified.

The value of this attribute need not be specified.

grade: a representation of the quality or the accuracy grade of a tolerance. Only symbols defined in ISO 286 shall be provided.

NOTE 3   The grade is one of the 18 international standard tolerance grades defined in ISO 286.

EXAMPLE 2   'IT07' is a standard tolerance grade.

4.3.14 Linear_distance   

EXPRESS specification:

*)
ENTITY Linear_distance
  SUBTYPE OF (Dimensional_location);
  orientation : OPTIONAL Axis_placement;
  diameter_qualifier : OPTIONAL diameter_qualifier_enumeration;
END_ENTITY;
(*

Attribute definitions:

orientation: a point and a direction along which the Linear_distance is measured. The direction is the x-axis of the axis placement. The value of this attribute need not be specified.

diameter_qualifier: if the distance is measured between objects that have a diameter such as a circle, cylinder or sphere this value specifies on whether to use the centre or inner or outer border of one object in relation to the other object. The enumeration value specifies the value for the relating followed by the value for the related object. If one of the objects has no diameter, then the centre value must be used. The value of this attribute shall not be specified if both objects are not of type circle, cylinder or sphere or for both objects if the centre position is taken.

4.3.15 Machining_feature_size   

EXPRESS specification:

*)
ENTITY Machining_feature_size
  SUBTYPE OF (Dimensional_size);
  considered_attribute : STRING;
END_ENTITY;
(*

Attribute definitions:

considered_attribute: an identification of a considered attribute.

4.3.16 Measurement_path   

EXAMPLE 1   A surface may only need to be smooth in one direction.

EXAMPLE 2   A dimension of a fillet may be specified by its arc length, which is a measurement path.

EXPRESS specification:

*)
ENTITY Measurement_path;
  defined_by : Curve;
  defined_in : Geometric_coordinate_space;
END_ENTITY;
(*

Attribute definitions:

defined_by: specifies the role of the Curve for the Measurement_path. The defined_by is the Curve along which the measurement takes place, or a requirement applies.

defined_in: specifies the role of the Geometric_coordinate_space for the Measurement_path. The defined_in is the Geometric_coordinate_space that identifies the geometric context in which the measurement path is evaluated.

4.3.17 Plus_minus_bounds   

EXPRESS specification:

*)
ENTITY Plus_minus_bounds
  SUPERTYPE OF (ONEOF (Angle_plus_minus_bounds,
                       Length_plus_minus_bounds));
  lower_bound : Value_with_unit;
  upper_bound : Value_with_unit;
END_ENTITY;
(*

Attribute definitions:

lower_bound: the lower offset.

NOTE 1   the lower_bound may be positive or negative.

upper_bound: the upper offset.

NOTE 2   the upper_bound may be positive or negative.

4.3.18 Radial_size   

EXPRESS specification:

*)
ENTITY Radial_size
  SUBTYPE OF (Dimensional_size);
  radius_type : OPTIONAL adjoining_or_centred;
  geometry_type : radial_type;
END_ENTITY;
(*

Attribute definitions:

radius_type: the specification of the method by which the radius is located. The value of this attribute need not be specified.

geometry_type: the kind of radius.

4.3.19 Thickness_size   

EXAMPLE 1   The remaining thickness below a blind hole might be specified as a Thickness_size.

EXAMPLE 2   The thickness of a coating layer is a Thickness_size.

EXPRESS specification:

*)
ENTITY Thickness_size
  SUBTYPE OF (Dimensional_size);
  used_path : OPTIONAL Measurement_path;
END_ENTITY;
(*

Attribute definitions:

used_path: the path along which the Thickness_size is applied or measured. The value of this attribute need not be specified.

4.3.20 Tolerance_range   

EXPRESS specification:

*)
ENTITY Tolerance_range;
  lower_range : Numerical_item_with_unit;
  upper_range : Numerical_item_with_unit;
END_ENTITY;
(*

Attribute definitions:

lower_range: the lower limit.

upper_range: the upper limit.

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