Integrated application resource: Draughting ISO 10303-101:2021(E)
© ISO

Cover page
Table of contents
Copyright
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
    3.1 Terms and definitions
    3.2 Abbreviated terms

4 Drawing definition
   4.1 General
   4.2 Fundamental concepts and assumptions
   4.3 Drawing definition type definition
   4.4 Drawing definition entity definitions
   4.5 Drawing definition rule definitions
5 Draughting element
   5.1 General
   5.2 Fundamental concepts and assumptions
   5.3 Draughting element type definitions
   5.4 Draughting element entity definitions
   5.5 Draughting element subtype constraint definition
6 Draughting dimension
   6.1 General
   6.2 Fundamental concepts and assumptions
   6.3 Draughting dimension entity definitions

A Short names of entities
B Information object registration
C Computer interpretable listings
D EXPRESS-G diagrams
E Change history
Bibliography
Index

5 Draughting element schema

5.1 General

The subjects of the draughting_element_schema are the basic draughting elements used on drawings to convey information about the product being depicted. Text using draughting-specific fonts and character sets is used to convey product and product-processing requirements and to make references to other requirements documents. Curves with draughting-specific thicknesses (widths) and dash patterns are used to clarify the depiction of a product shape. Images of the shape are annotated with curves representing feature centres, path of motion, and location of cutting planes. The draughting activity also uses many symbols to convey requirements for characteristics such as surface texture and welds. These draughting curves, text, and symbols are often combined to form a complete presentation of a requirement and are referred to as a draughting callout.

Draughting often applies a requirement to a specific area of the depicted product shape. In such instances other draughting curves, such as leader lines, projection lines, and dimension lines, are used to direct the requirement to the place of application.

This schema specifies the basic draughting elements and their combinations used to annotate the depicted product shape and convey information regarding interpretation of the drawing.

This clause defines the information requirements to which implementations shall conform using the EXPRESS language as defined in ISO 10303-11. The following EXPRESS declaration begins the draughting_element_schema and identifies the necessary external references.

Each implementation of an AP that uses this schema and that encodes entity names shall use the encoding specified in Annex A. Each reference to this schema in an open system shall use the identifier encoding specified in Annex B. This schema is illustrated in Annex D using the EXPRESS-G notation.

EXPRESS specification:

*)
SCHEMA draughting_element_schema;

REFERENCE FROM geometric_model_schema    --  ISO 10303-42
  (geometric_set,
   tessellated_geometric_set);

REFERENCE FROM geometry_schema    --  ISO 10303-42
  (axis2_placement,
   axis2_placement_2d,
   axis2_placement_3d,
   cartesian_point,
   geometric_representation_item,
   plane);

REFERENCE FROM mechanical_design_schema    --  ISO 10303-113
  (annotation_placeholder_occurrence);

REFERENCE FROM presentation_appearance_schema    --  ISO 10303-46
  (invisible_item,
   presentation_style_assignment,
   styled_item);

REFERENCE FROM presentation_definition_schema    --  ISO 10303-46
  (annotation_occurrence,
   annotation_curve_occurrence,
   annotation_fill_area_occurrence,
   annotation_text_occurrence,
   annotation_symbol_occurrence);

REFERENCE FROM presentation_organization_schema    --  ISO 10303-46
  (annotation_representation_select,
   area_dependent_annotation_representation,
   camera_model,
   presentation_area,
   presentation_view,
   view_dependent_annotation_representation);

REFERENCE FROM presentation_resource_schema    --  ISO 10303-46
  (planar_box);

REFERENCE FROM product_property_definition_schema    --  ISO 10303-41
  (product_definition_shape,
   property_definition,
   shape_aspect,
   shape_aspect_relationship);

REFERENCE FROM product_property_representation_schema    --  ISO 10303-41
  (item_identified_representation_usage,
   shape_definition_representation);

REFERENCE FROM representation_schema    --  ISO 10303-43
  (representation,
   representation_item,
   mapped_item,
   representation_map,
   using_representations);

REFERENCE FROM support_resource_schema    --  ISO 10303-41
  (label,
   text,
   bag_to_set);

REFERENCE FROM topology_schema    --  ISO 10303-42
  (face_surface);
(*

NOTE 1   The schemas referenced above are specified in the following parts:

geometric_model_schema ISO 10303-42
geometry_schema ISO 10303-42
mechanical_design_schema ISO 10303-113
presentation_appearance_schema ISO 10303-46
presentation_definition_schema ISO 10303-46
presentation_organization_schema ISO 10303-46
presentation_resource_schema ISO 10303-46
product_property_definition_schema ISO 10303-41
product_property_representation_schema ISO 10303-41
representation_schema ISO 10303-43
support_resource_schema ISO 10303-41
topology_schema ISO 10303-42

NOTE 2   See Annex D for a graphical representation of this schema.

5.2 Fundamental concepts and assumptions

The draughting activity, regardless of the engineering discipline, specializes generic annotation curves, symbols, and text. The specialization of annotation curves is based on the need to identify certain curves according to existing draughting standards. Further, the specialization makes it possible to assign curve presentation styles according to those same standards. The specialization of generic annotation text is based on the draughting need to specify draughting-specific fonts and character sets. The specialization of generic annotation symbols is based on the need for draughting symbols to be comprised of draughting-specific curves and text.

The three most common draughting-specific annotation curves are the dimension line, leader line, and projection line (also known as an extension line or witness line). These draughting annotation curves are not limited to their stated geometric type. A leader line referring to a feature on a drawing, such as a dimension, object, or outline, is really a series of one-to-many curve segments, not necessarily line segments. This fact is also true of the projection line and dimension line.

Dimension lines, leader lines, and projection lines can be shared by more than one callout.

EXAMPLE 1   A single instance of a leader line can be used to direct (refer) a callout, containing a dimension value and tolerance, while also directing a second callout, containing a geometric tolerance of location, to the same feature of size (see Figure 2).

Dimension lines and leader lines cannot exist independently of a callout. Only the projection line can exist independently (without directing a callout).

A callout directed by means of both a leader line and a projection line is both a leader-directed callout and a projection-directed callout.



Figure 2 —  Leader line shared by dimension and tolerance

Figure 2 —  Leader line shared by dimension and tolerance

A terminator symbol (e.g., arrowhead) is another concept of existing draughting-practices standards. A terminator symbol may be used to terminate a leader line, or it may be used to show the extent of the dimension and the direction of measurement when placed along a dimension line. Although referred to as an arrow or arrowhead, some draughting practices standards specify other symbols, such as a dot, box, or slash to terminate a leader line or indicate a dimension extent. Therefore, this concept has been generalized as a terminator symbol.

A draughting callout is a collection of draughting- or presentation-specific annotation curves, text, and symbols depicting information or requirements about the product or drawing itself. This part of ISO 10303 supports callouts which may contain text, symbols, or curves that are directed to a feature (a place on a drawing) by a leader line, a projection line, a dimension line, or a combination of these. A callout whose text, symbols, or curves are directed by means of both a leader line and a projection line is both a leader-directed callout and a projection callout.

A leader line is a draughting element that may be explicitly provided or may be an annotation_placeholder_leader_line that only consist of a list of points with an associated optional terminator symbol. The terminator symbols for the annotation_placeholder_leader_line are defined by the des_apll_point_symbol enumeration type. An annotation_placeholder_occurrence_with_leader_line aggregates one or more annotation_placeholder_leader_line to provide data necessary to render needed leader lines associated with a specific annotation occurrence.

EXAMPLE 2   An annotation_placeholder_occurrence_with_leader_line specifies two annotation_placeholder_leader_lines, one of which is an annotation_to_model_leader_line, illustrated in Figure 3, and the other of which is an auxiliary_leader_line, illustrated in Figure 4, to provide location data for a placeholder for presentation of a geometric tolerance. The point list for Figure 3 is (A1, A2, A3) while that for Figure 4 is (B1, B2, B3).



Figure 3 —  An annotation_to_model_leader_line with forward arrowhead that starts at annotation and ends at model

Figure 3 —  An annotation_to_model_leader_line with forward arrowhead that starts at annotation and ends at model



Figure 4 —  An auxiliary_leader_line with forward arrowhead that starts at a random location and ends at model

Figure 4 —  An auxiliary_leader_line with forward arrowhead that starts at a random location and ends at model

EXAMPLE 3   An annotation_placeholder_occurrence_with_leader_line specifies two annotation_to_model_leader_line, one of which is illustrated in Figure 5, and the other illustrated in Figure 6, to provide location data for a placeholder for presentation of a geometric tolerance. The point list for Figure 5 is (A1, A2, A3) while that for Figure 6 is (B1, B2, B3, B4).



Figure 5 —  An annotation_to_model_leader_line with no arrowhead that starts at annotation and ends at model

Figure 5 —  An annotation_to_model_leader_line with no arrowhead that starts at annotation and ends at model



Figure 6 —  An annotation_to_model_leader_line with internal arrowhead pair that starts at annotation and ends at model

Figure 6 —  An annotation_to_model_leader_line with internal arrowhead pair that starts at annotation and ends at model

Draughting Application Protocols may further specialize resources found in this schema or in ISO 10303-46 to obtain draughting concepts not explicitly provided.

5.3 draughting_element_schema type definitions

5.3.1 annotation_plane_element   EXPRESS-G

The annotation_plane_element type is a list of alternate data types. It provides a mechanism to refer to an instance of one of these data types.

EXPRESS specification:

*)
TYPE annotation_plane_element = SELECT
   (draughting_callout,
    styled_item);
END_TYPE;
(*

5.3.2 des_annotation_representation_select   EXPRESS-G

The des_annotation_representation_select type is an extension of the annotation_representation_select type. It adds the data type draughting_model to the list of alternate data types.

NOTE  The list of entity data types will be extended in application resources that use the constructs of this resource.

EXPRESS specification:

*)
TYPE des_annotation_representation_select = EXTENSIBLE GENERIC_ENTITY SELECT BASED_ON annotation_representation_select WITH
   (draughting_model);
END_TYPE;
(*

5.3.3 des_apll_point_select   EXPRESS-G

The des_apll_point_select type is a list of alternate data types. It provides a mechanism to refer to an instance of one of these data types.

EXPRESS specification:

*)
TYPE des_apll_point_select = SELECT
   (apll_point,
    apll_point_with_surface);
END_TYPE;
(*

5.3.4 des_apll_point_symbol   EXPRESS-G

The des_apll_point_symbol provides an identification of the required symbol to be used in a specific segment of a leader line.

NOTE 1   The actual graphic of the symbol is not provided, but the interpretation shall be in accordance with applicable draughting standards. In Figures 7 through 11 the first line of text in the rectangular box identifies the type of apll_point illustrated and the second line identifies the value of the des_apll_point_symbol applied to that point in the data set.

EXPRESS specification:

*)
TYPE des_apll_point_symbol = ENUMERATION OF
   (circle,
    dot,
    internal_pair_forward_arrowhead,
    internal_pair_reverse_arrowhead,
    none,
    positive_arrowhead,
    triangle);
END_TYPE;
(*

Enumerated item definitions:

circle: a circle is to be applied to the point specified in the leader line.

NOTE 2   Figure 7 illustrates the 'as provided' data for the application of a circle to a leader line. The point list for Figure 7 is (A1, A2, A3).



Figure 7 —  An annotation_to_model_leader_line circle as an "as provided" example

Figure 7 —  An annotation_to_model_leader_line circle as an "as provided" example

NOTE 3   Figure 8 illustrates the 'as rendered' presentation for the application of a circle to a leader line. The point list for Figure 8 is (A1, A2, A3).



Figure 8 —  An annotation_to_model_leader_line circle as an "as rendered" example

Figure 8 —  An annotation_to_model_leader_line circle as an "as rendered" example

dot: a dot is to be applied to the point specified in the leader line.

internal_pair_forward_arrowhead: an internal_pair_forward_arrowhead is one end of a pair of arrows where there is no annotation between the arrows. Forward is to be interpreted as the leader line arrives to the point. The arrowhead is at a point with an index in the list of points that is greater than the point to which the internal_pair_reverse_arrowhead is applied.

NOTE 4   Figure 9 illustrates the 'as rendered' presentation for the application of both the internal pair forward and reverse arrowheads to a leader line. The point list for Figure 9 is (B1, B2, B3, B4).



Figure 9 —  An annotation_to_model_leader_line arrowhead pair as an "as rendered" example

Figure 9 —  An annotation_to_model_leader_line arrowhead pair as an "as rendered" example

internal_pair_reverse_arrowhead: an internal_pair_reverse_arrowhead is one end of a pair of arrows where there is no annotation between the arrows. Reverse is to be interpreted as the leader line leaves the point. The arrowhead is at a point with an index in the list of points that is less than the point to which the internal_pair_forward_arrowhead is applied.

none: there is no symbol applied.

positive_arrowhead: a positive_arrowhead is applied to a point where the index of the point in the list of points is greater than the index of the first point in the list.

NOTE 5   Figure 10 illustrates the 'as rendered' presentation for the application of a positive arrowhead to a leader line.The point list for Figure 10 is (A1, A2, A3).



Figure 10 —  An annotation_to_model_leader_line positive arrowhead as an "as rendered" example

Figure 10 —  An annotation_to_model_leader_line positive arrowhead as an "as rendered" example

triangle: a triangle is applied to a point where the index of the point in the list of points is greater than the index of the first point in the list.

NOTE 6   A triangle is applied to the last element in the list of points in most industrial date exchange scenarios.

NOTE 7   Figure 11 illustrates the 'as rendered' presentation for the application of a triangle to a leader line between two annotation elements. The point list for Figure 11 is (A11, A12).



Figure 11 —  An annotation_to_annotation_leader_line triangle as an "as rendered" example

Figure 11 —  An annotation_to_annotation_leader_line triangle as an "as rendered" example

5.3.5 des_invisible_item   EXPRESS-G

The des_invisible_item type is an extension of the invisible_item type. It adds the data type draughting_callout to the list of alternate data types.

NOTE  The list of entity data types will be extended in application resources that use the constructs of this resource.

EXPRESS specification:

*)
TYPE des_invisible_item = EXTENSIBLE GENERIC_ENTITY SELECT BASED_ON invisible_item WITH
   (draughting_callout);
END_TYPE;
(*

5.3.6 dimension_extent_usage   EXPRESS-G

The dimension_extent_usage establishes the logical location of terminator symbols on the dimension line. The logical location is defined by an origin and a target.

EXPRESS specification:

*)
TYPE dimension_extent_usage = ENUMERATION OF
   (origin,
    target);
END_TYPE;
(*

Enumerated item definitions:

origin: the beginning of the dimension.

target: the end of the dimension.

5.3.7 draughting_callout_element   EXPRESS-G

The draughting_callout_element type is an extensible list of alternate data types. It provides a mechanism to refer to instances of the data types included in the draughting_callout_element type or in its extensions.

NOTE  The list of entity data types will be extended in application resources that use the constructs of this resource.

A draughting_callout_element is either draughting text, symbols, fill area, or curves which are a part of a draughting callout. A draughting_callout_element may be extended in applications that use this resource.

EXPRESS specification:

*)
TYPE draughting_callout_element = EXTENSIBLE GENERIC_ENTITY SELECT
   (annotation_curve_occurrence,
    annotation_fill_area_occurrence,
    annotation_symbol_occurrence,
    annotation_text_occurrence,
    tessellated_annotation_occurrence);
END_TYPE;
(*

5.3.8 draughting_model_item_association_select   EXPRESS-G

The draughting_model_item_association_select type is a list of alternate data types. It provides a mechanism to refer to an instance of one of these data types.

EXPRESS specification:

*)
TYPE draughting_model_item_association_select = SELECT
   (annotation_occurrence,
    draughting_callout);
END_TYPE;
(*

5.3.9 draughting_model_item_definition   EXPRESS-G

The draughting_model_item_definition type is an extensible list of alternate data types. It provides a mechanism to refer to instances of the data types included in the draughting_model_item_definition type or in its extensions.

NOTE  The list of entity data types will be extended in application resources that use the constructs of this resource.

EXPRESS specification:

*)
TYPE draughting_model_item_definition = EXTENSIBLE GENERIC_ENTITY SELECT
   (product_definition_shape,
    property_definition,
    shape_aspect,
    shape_aspect_relationship);
END_TYPE;
(*

5.3.10 draughting_model_item_select   EXPRESS-G

The draughting_model_item_select type is a list of alternate data types. It provides a mechanism to refer to an instance of one of these data types.

EXPRESS specification:

*)
TYPE draughting_model_item_select = SELECT
   (mapped_item,
    styled_item,
    axis2_placement,
    camera_model,
    draughting_callout);
END_TYPE;
(*

5.3.11 plane_or_planar_box   EXPRESS-G

The plane_or_planar_box type is a list of alternate data types. It provides a mechanism to refer to an instance of one of these data types.

EXPRESS specification:

*)
TYPE plane_or_planar_box = SELECT
   (plane,
    planar_box);
END_TYPE;
(*

5.4 draughting_element_schema entity definitions

5.4.1 annotation_placeholder_leader_line   EXPRESS-G

An annotation_placeholder_leader_line is a type of geometric_representation_item that relates an annotation to another annotation or to a product geometric model, either directly or indirectly through supplemental geometry or through dimension lines and dimension curves. The leader line may start in free space in the coordinate system. An annotation_placeholder_leader_line is an abstract supertype of one of the following: annotation_to_annotation_leader_line, annotation_to_model_leader_line, or auxiliary_leader_line. An annotation_placeholder_leader_line provides a list of unique points; each element in the list is either an apll_point or an apll_point_with_surface.

NOTE    The role of an annotation_placeholder_leader_line is to provide a simplified representation for leader line.

EXAMPLE    An annotation contains a graphic relating a datum feature symbol to a datum reference frame. An annotation_to_annotation_leader_line provides a simplified representation for the graphic.

EXPRESS specification:

*)
ENTITY annotation_placeholder_leader_line
  ABSTRACT SUPERTYPE OF (ONEOF (annotation_to_annotation_leader_line,
                                annotation_to_model_leader_line,
                                auxiliary_leader_line))
  SUBTYPE OF (geometric_representation_item);
  geometric_elements : LIST[2:?] OF UNIQUE des_apll_point_select;
DERIVE
  model_end : des_apll_point_select := geometric_elements[HIINDEX(geometric_elements)];
INVERSE
  container : annotation_placeholder_occurrence_with_leader_line FOR leader_line;
UNIQUE
  UR1: geometric_elements;
END_ENTITY;
(*

Attribute definitions:

geometric_elements: specifies the list of points for the simplified representation.

model_end: specifies the terminus of the annotation_placeholder_leader_line that is on, or near, the surface of the product model, or is on a dimension line, or on a curve attached to a dimension line, or to an extension line, or is on another annotation that is more directly connected to the product model.

container: an inverse relationship that specifies that the existence of the annotation_placeholder_leader_line is dependent on the existence of the annotation_placeholder_occurrence_with_leader_line that specifies the annotation_placeholder_leader_line as a member of its leader_line.

Formal propositions:

UR1: No more than one member of annotation_placeholder_leader_line shall reference a specific aggregate of geometric_elements.

5.4.2 annotation_placeholder_occurrence_with_leader_line   EXPRESS-G

An annotation_placeholder_occurrence_with_leader_line is a type of annotation_placeholder_occurrence that provides a simplified representation of one or more leader lines in the annotation_placeholder_occurrence.

EXPRESS specification:

*)
ENTITY annotation_placeholder_occurrence_with_leader_line
  SUBTYPE OF (annotation_placeholder_occurrence);
  leader_line : SET[1:?] OF annotation_placeholder_leader_line;
UNIQUE
  UR1: leader_line;
END_ENTITY;
(*

Attribute definitions:

leader_line: specifies the set of annotation_placeholder_leader_line that comprise the leader line contents.

Formal propositions:

UR1: No more than one member of annotation_placeholder_occurrence_with_leader_line shall reference a specific aggregate leader_line.

5.4.3 annotation_plane   EXPRESS-G

An annotation_plane is a type of annotation_occurrence and a type of geometric_representation_item for the purpose of grouping annotation elements within a 3D coordinate space. The plane may be bounded by a rectangle and styled so that it becomes visible. The interpretation for text in the plane shall be that x axis is the “line that is being written on”, indicating the reading direction. The interpretation shall be that the y axis points upward from the base to the top of the characters. The interpretation shall be that the z axis points towards the reader. Elements referenced by annotation_plane shall be in planes that are parallel to the annotaion_plane with the exception of leader lines which need not be parallel to the annotation_plane.

NOTE    A receiving system may need to project leader lines to the relevant plane.

An annotation_plane may satisfy the requirements for an annotation plane specified in ISO 16792 when all the members of elements are intended to be on the same plane and only numeric accuracy prevents the data from being co-planar.

EXPRESS specification:

*)
ENTITY annotation_plane
  SUBTYPE OF (annotation_occurrence, geometric_representation_item);
  elements : OPTIONAL SET[1:?] OF annotation_plane_element;
  SELF\styled_item.item : plane_or_planar_box;
WHERE
  WR1: SELF\geometric_representation_item.dim = 3;
  WR2: NOT('PRESENTATION_RESOURCE_SCHEMA.'+'PLANAR_BOX' IN TYPEOF(SELF\styled_item.item)) OR ('GEOMETRY_SCHEMA.'+'AXIS2_PLACEMENT_3D' IN TYPEOF(SELF\styled_item.item\planar_box.placement));
  WR3: (('PRESENTATION_RESOURCE_SCHEMA.'+'PLANAR_BOX' IN TYPEOF(SELF\styled_item.item)) AND ('PRESENTATION_APPEARANCE_SCHEMA.'+'CURVE_STYLE' IN TYPEOF(SELF\styled_item.styles[1]\presentation_style_assignment.styles[1]))) OR (('GEOMETRY_SCHEMA.'+'PLANE' IN TYPEOF(SELF\styled_item.item)) AND ('PRESENTATION_APPEARANCE_SCHEMA.'+'FILL_AREA_STYLE' IN TYPEOF(SELF\styled_item.styles[1]\presentation_style_assignment.styles[1])));
  WR4: (SIZEOF(SELF\styled_item.styles) = 1) AND (SIZEOF(SELF\styled_item.styles[1]\presentation_style_assignment.styles) = 1);
END_ENTITY;
(*

Attribute definitions:

elements: the annotation_plane_elements that are within the annotation_plane.

item: the plane_or_planar_box that is styled by the annotation_plane.

Formal propositions:

WR1: An annotation_plane shall be defined in 3D space.

WR2: If item is a planar_box then it shall be placed by an axis2_placement_3d.

WR3: Allowed styles are fill_area_style for plane and fill_area_style or curve_style for planar_box.

WR4: An annotation_plane shall have exactly one style.

Informal propositions:

IP1: The elements should be located in the definition plane.

NOTE    Because of numerical inaccuracy this might not be perfectly the case. A receiving system may correct such a deviation.

5.4.4 annotation_to_annotation_leader_line   EXPRESS-G

An annotation_to_annotation_leader_line is a type of annotation_placeholder_leader_line that provides a simplified representation of the graphic visually connecting one annotation to another.

EXPRESS specification:

*)
ENTITY annotation_to_annotation_leader_line
  SUBTYPE OF (annotation_placeholder_leader_line);
DERIVE
  start_end : des_apll_point_select := SELF\annotation_placeholder_leader_line.geometric_elements[1];
WHERE
  WR1: (SIZEOF (['DRAUGHTING_ELEMENT_SCHEMA.APLL_POINT_WITH_SURFACE'] * TYPEOF(SELF\annotation_placeholder_leader_line.model_end)) = 0) AND (SIZEOF (['DRAUGHTING_ELEMENT_SCHEMA.APLL_POINT_WITH_SURFACE'] * TYPEOF(start_end)) = 0);
END_ENTITY;
(*

Attribute definitions:

start_end: specifies the first element of the attribute geometric_elements inherited from annotation_placeholder_leader_line.

Formal propositions:

WR1: Each annotation_to_annotation_leader_line starts and ends on a curve.

5.4.5 annotation_to_model_leader_line   EXPRESS-G

An annotation_to_model_leader_line is a type of annotation_placeholder_leader_line that provides a simplified representation of the graphic visually connecting an annotation to the product model.

EXPRESS specification:

*)
ENTITY annotation_to_model_leader_line
  SUBTYPE OF (annotation_placeholder_leader_line);
DERIVE
  start_end : des_apll_point_select := SELF\annotation_placeholder_leader_line.geometric_elements[1];
WHERE
  WR1: SIZEOF (['DRAUGHTING_ELEMENT_SCHEMA.APLL_POINT_WITH_SURFACE'] * TYPEOF(SELF\annotation_placeholder_leader_line.model_end)) = 1;
  WR2: SIZEOF (['DRAUGHTING_ELEMENT_SCHEMA.APLL_POINT_WITH_SURFACE'] * TYPEOF(start_end)) = 0;
END_ENTITY;
(*

Attribute definitions:

start_end: specifies the first element of the attribute geometric_elements inherited from annotation_placeholder_leader_line.

Formal propositions:

WR1: An annotation_to_model_leader_line shall end on the product model.

WR2: The geometric_elements inherited from annotation_placeholder_leader_line shall not start on the part model.

5.4.6 apll_point   EXPRESS-G

An apll_point is a type of cartesian_point included to help compose a list of points that represent starting points, midpoints, and end points for a receiver to implement presentation information.

EXPRESS specification:

*)
ENTITY apll_point
  SUBTYPE OF (cartesian_point);
  symbol_applied : des_apll_point_symbol;
INVERSE
  container : annotation_placeholder_leader_line FOR geometric_elements;
WHERE
  WR1: SIZEOF(['DRAUGHTING_ELEMENT_SCHEMA.APLL_POINT_WITH_SURFACE'] * TYPEOF(SELF)) = 0;
  WR2: SIZEOF(USEDIN(SELF, 'GEOMETRY_SCHEMA.GEOMETRIC_SET.ELEMENTS')) = 0;
END_ENTITY;
(*

Attribute definitions:

symbol_applied: specifies the symbol to be applied to the apll_point.

container: an inverse relationship that specifies that the existence of the apll_point is dependent on the existence of the annotation_placeholder_leader_line that specifies the apll_point as a member of its geometric_elements.

Formal propositions:

WR1: No member of apll_point shall also be a member of apll_point_with_surface.

WR2: No member of apll_point shall be referenced by the geometric_set referenced by item.

5.4.7 apll_point_with_surface   EXPRESS-G

An apll_point_with_surface is a type of cartesian_point included to help compose a list of points that represent starting points, midpoints, and end points for a receiver to implement presentation information.

NOTE    In industrial practice it is common to terminate the simplified leader line representation with an apll_point_with_surface.

EXPRESS specification:

*)
ENTITY apll_point_with_surface
  SUBTYPE OF (cartesian_point);
  symbol_applied : des_apll_point_symbol;
  associated_surface : face_surface;
INVERSE
  container : annotation_placeholder_leader_line FOR geometric_elements;
WHERE
  WR1: SIZEOF(['DRAUGHTING_ELEMENT_SCHEMA.APLL_POINT'] * TYPEOF(SELF)) = 0;
  WR2: SIZEOF(USEDIN(SELF, 'GEOMETRY_SCHEMA.GEOMETRIC_SET.ELEMENTS')) = 0;
END_ENTITY;
(*

Attribute definitions:

symbol_applied: specifies the symbol to be applied to the apll_point_with_surface.

associated_surface: specifies the surface that is the logical target for the simplified representation of a leader line that points to a product model.

container: an inverse relationship that specifies that the existence of the apll_point_with_surface is dependent on the existence of the annotation_placeholder_leader_line that specifies the apll_point_with_surface as a member of its geometric_elements.

Formal propositions:

WR1: No member of apll_point_with_surface shall also be a member of apll_point.

WR2: No member of apll_point_with_surface shall be referenced by the geometric_set referenced by item.

5.4.8 auxiliary_leader_line   EXPRESS-G

An auxiliary_leader_line is a type of annotation_placeholder_leader_line that provides a simplified representation of the graphic visually connecting a leader line that is dependent on another leader line to construction geometry that is connected to a product model.

EXPRESS specification:

*)
ENTITY auxiliary_leader_line
  SUBTYPE OF (annotation_placeholder_leader_line);
  controlling_leader_line : annotation_to_model_leader_line;
DERIVE
  free_space_end : des_apll_point_select := SELF\annotation_placeholder_leader_line.geometric_elements[1];
WHERE
  WR1: SELF\annotation_placeholder_leader_line.container :=: controlling_leader_line\annotation_placeholder_leader_line.container;
  WR2: SIZEOF (['DRAUGHTING_ELEMENT_SCHEMA.APLL_POINT_WITH_SURFACE'] * TYPEOF(free_space_end)) = 0;
  WR3: SIZEOF (['DRAUGHTING_ELEMENT_SCHEMA.APLL_POINT_WITH_SURFACE'] * TYPEOF(SELF\annotation_placeholder_leader_line.model_end)) = 1;
END_ENTITY;
(*

Attribute definitions:

controlling_leader_line: specifies the annotation_to_model_leader_line that controls this auxiliary_leader_line.

free_space_end: specifies the first element of the attribute geometric_elements inherited from annotation_placeholder_leader_line which is a point at an arbitrary location.

Formal propositions:

WR1: An auxiliary_leader_line shall be associated to the annotation_placeholder_occurrence_with_leader_line that is associated to the controlling_leader_line.

WR2: The geometric_elements inherited from annotation_placeholder_leader_line shall not start on annotation nor shall it start on the part model.

WR3: The geometric_elements inherited from annotation_placeholder_leader_line shall end on the part model.

5.4.9 dimension_curve   EXPRESS-G

A dimension_curve is a type of annotation_curve_occurrence. A dimension_curve is a draughting annotation curve with a draughting-specific appearance that, with related terminator symbols, presents the direction and extent of a measurement. The dimension curve is also used to direct the presentation of dimension-related information to the presentation of the applicable feature or features.

A dimension_curve shall satisfy the requirements for a dimension line specified in ISO 129-1.

A dimension_curve is used in a dimension_curve_directed_callout to direct the other elements of the callout to the presentation of the dimensioned feature or features.

NOTE 1   Various forms of the dimension curve, also known as a dimension line, with their related terminator symbols are shown in Figure 12. Dimension curves are combined with other draughting annotation curves (e.g., extension lines), text, and symbols to form dimension_curve_directed_callout and dimension_graphs.



Figure 12 —  Dimension curves

Figure 12 —  Dimension curves

NOTE 2   Although the dimension_curve is generally thin and continuous in nature, it may be broken for the insertion of the dimension text and symbols, making the dimension_curve appear as two leader lines. A break in the dimension_curve is possible through use of resources provided by ISO 10303-46.

EXPRESS specification:

*)
ENTITY dimension_curve
  SUBTYPE OF (annotation_curve_occurrence);
WHERE
  WR1: (SIZEOF( QUERY(dct <* USEDIN(SELF,'DRAUGHTING_ELEMENT_SCHEMA.' + 'TERMINATOR_SYMBOL.ANNOTATED_CURVE') | (('DRAUGHTING_ELEMENT_SCHEMA.'+ 'DIMENSION_CURVE_TERMINATOR' IN TYPEOF(dct)) )) ) <= 2);
  WR2: SIZEOF( QUERY( dcdc <* USEDIN(SELF,'DRAUGHTING_ELEMENT_SCHEMA.' + 'DRAUGHTING_CALLOUT.CONTENTS') | ('DRAUGHTING_ELEMENT_SCHEMA.'+ 'DIMENSION_CURVE_DIRECTED_CALLOUT' IN TYPEOF(dcdc))) )>= 1;
  WR3: (SIZEOF( QUERY(dct1 <* USEDIN(SELF,'DRAUGHTING_ELEMENT_SCHEMA.' + 'TERMINATOR_SYMBOL.ANNOTATED_CURVE') | (('DRAUGHTING_ELEMENT_SCHEMA.'+ 'DIMENSION_CURVE_TERMINATOR' IN TYPEOF(dct1)) AND (dct1\dimension_curve_terminator.role = dimension_extent_usage.origin))) ) <= 1) AND (SIZEOF( QUERY (dct2 <* USEDIN(SELF,'DRAUGHTING_ELEMENT_SCHEMA.'+ 'TERMINATOR_SYMBOL.ANNOTATED_CURVE') | (('DRAUGHTING_ELEMENT_SCHEMA.'+ 'DIMENSION_CURVE_TERMINATOR' IN TYPEOF(dct2)) AND (dct2\dimension_curve_terminator.role = dimension_extent_usage.target))) ) <= 1);
END_ENTITY;
(*

Formal propositions:

WR1: There may be zero, one, or two dimension_curve_terminators annotating a dimension_curve.

WR2: A dimension_curve shall be used by at least one referencing dimension_curve_directed_callout.

NOTE 3   A dimension_curve is used to direct information to the dimensioned feature or features. Curves which do not meet this requirement should be treated as annotation curves with referencing terminator_symbols.

WR3: A dimension_curve shall not be annotated with more than one terminator_symbol indicating the origin of a dimension extent, nor shall a dimension_curve be annotated with more than one terminator_symbol indicating the target of a dimension extent.

5.4.10 dimension_curve_directed_callout   EXPRESS-G

A dimension_curve_directed_callout is a type of draughting_callout directed by a dimension line to a presented element of the product shape.

NOTE 1   A draughting_callout for a geometric tolerance may be directed to the presentation of the toleranced feature by means of a dimension line. An example of a dimension curve directed callout is shown in Figure 13.

NOTE 2   Generally, a dimension_curve for a dimension_curve_directed_callout is also the dimension_curve for a dimension_graph.



Figure 13 —  Dimension curve directed callout

Figure 13 —  Dimension curve directed callout

EXPRESS specification:

*)
ENTITY dimension_curve_directed_callout
  SUBTYPE OF (draughting_callout);
WHERE
  WR1: SIZEOF(QUERY(d_c<*SELF\draughting_callout.contents | 'DRAUGHTING_ELEMENT_SCHEMA.DIMENSION_CURVE' IN (TYPEOF(d_c))))<=2;
  WR2: SIZEOF(SELF\draughting_callout.contents) >= 2;
END_ENTITY;
(*

Formal propositions:

WR1: A dimension_curve_directed_callout shall have exactly one dimension_curve in the set of draughting_callout_elements.

WR2: A dimension_curve_directed_callout shall contain some annotation other than the required dimension_curve.

5.4.11 dimension_curve_terminator   EXPRESS-G

A dimension_curve_terminator is a type of terminator_symbol. A dimension_curve_terminator is a symbol representing the start or terminus of a dimension extent. When an arrow is used for the dimension_curve_terminator, it also indicates the measuring direction of a dimension.

EXPRESS specification:

*)
ENTITY dimension_curve_terminator
  SUBTYPE OF (terminator_symbol);
  role : dimension_extent_usage;
WHERE
  WR1: 'DRAUGHTING_ELEMENT_SCHEMA.DIMENSION_CURVE' IN TYPEOF (SELF\terminator_symbol.annotated_curve);
END_ENTITY;
(*

Attribute definitions:

role: the role of the dimension_curve_terminator as a dimension origin or target in the presentation of the dimension extent being graphed.

NOTE    A dimension_curve_terminator in the role of origin is located with respect to a point on the dimension line, generally corresponding to the beginning or start of a dimension. A dimension_curve_terminator in the role of target is located with respect to a point on the dimension line, generally corresponding to the end of a dimension. Where a dimension_curve_terminator is to correspond with the dimension_graph_projection_curve_usage, the same role should be assigned to both with respect to the extent of the dimension_graph.

Formal propositions:

WR1: Each dimension_curve_terminator shall annotate a dimension_curve.

5.4.12 draughting_callout   EXPRESS-G

A draughting_callout is a type of geometric_representation_item. A draughting_callout is a human-interpretable collection of annotation curves, symbols, and text that presents product requirements or information used to interpret the drawing.

A draughting_callout is classified by the type of curve that directs information within the draughting_callout or by its contents that present product requirements such as dimension measurements.

A draughting_callout may contain text, symbols, and curves which are directed to a place of interest on the drawing by means of a leader line, projection line, dimension line, or a combination of these. A draughting_callout that includes a leader line to direct the eye of the reader to a place of interest is a leader_directed_callout. A draughting_callout that includes a projection line to direct the eye of the reader to a place of interest is a projection_directed_callout. A draughting_callout that includes a dimension line to direct information in the callout is a dimension_curve_directed_callout.

If the draughting_callout is to present a product requirement about a known dimension measurement, it is a dimension_callout.

EXPRESS specification:

*)
ENTITY draughting_callout
  SUBTYPE OF (geometric_representation_item);
  contents : SET[1:?] OF draughting_callout_element;
WHERE
  WR1: (SIZEOF (QUERY (l_1 <* SELF\draughting_callout.contents | 'DRAUGHTING_ELEMENT_SCHEMA.LEADER_CURVE' IN (TYPEOF(l_1)))) = 0) OR ('DRAUGHTING_ELEMENT_SCHEMA.LEADER_DIRECTED_CALLOUT' IN (TYPEOF(SELF))) AND (SIZEOF (QUERY (l_1 <* SELF\draughting_callout.contents | 'DRAUGHTING_ELEMENT_SCHEMA.PROJECTION_CURVE' IN (TYPEOF(l_1)))) = 0) OR ('DRAUGHTING_ELEMENT_SCHEMA.PROJECTION_DIRECTED_CALLOUT' IN (TYPEOF(SELF))) AND (SIZEOF (QUERY (l_1 <* SELF\draughting_callout.contents | 'DRAUGHTING_ELEMENT_SCHEMA.DIMENSION_CURVE' IN (TYPEOF(l_1)))) = 0) OR ('DRAUGHTING_ELEMENT_SCHEMA.DIMENSION_CURVE_DIRECTED_CALLOUT' IN (TYPEOF(SELF)));
  WR2: SIZEOF (QUERY ( apo <* contents | 'MECHANICAL_DESIGN_SCHEMA.ANNOTATION_PLACEHOLDER_OCCURRENCE' in TYPEOF(apo) )) < 2;
END_ENTITY;
(*

Attribute definitions:

contents: the annotation curves, symbols, or text comprising the presentation of information.

Formal propositions:

WR1: A draughting callout that includes a leader line shall be a leader_directed_callout. A draughting callout that includes a projection line shall be a projection_directed_callout. A draughting callout that includes a dimension line shall be a dimension dimension_curve_directed_callout.

WR2: There shall be no more than one annotation_placeholder_occurrence in draughting_callout.

5.4.13 draughting_callout_relationship   EXPRESS-G

A draughting_callout_relationship is a logical relationship between two annotation groups which appear on a drawing. Such relationships are often implied by the creator of a drawing by placing a group of annotations in the proximity of another group of annotations. See examples 1 and 2 below.

NOTE 1   This entity, in conjunction with the draughting_callout entity, is based on the relationship template that is described in ISO 10303-41.

EXPRESS specification:

*)
ENTITY draughting_callout_relationship;
  name : label;
  description : text;
  relating_draughting_callout : draughting_callout;
  related_draughting_callout : draughting_callout;
END_ENTITY;
(*

Attribute definitions:

name: the word or group of words by which the draughting_callout_relationship is spoken of or referred to.

description: the text that relates the nature of the draughting_callout_relationship.

relating_draughting_callout: one of the draughting_callouts which is a part of the relationship.

EXAMPLE 1   If the draughting_callout_relationship is a relationship between a leader directed dimension and a geometric tolerance frame (see Figure 2), the relating draughting_callout may be the leader directed dimension for a feature of size.

NOTE 2   The role of this attribute is defined in the application protocol or the ISO 10303 integrated resource that uses or specializes this entity.

related_draughting_callout: the other draughting_callout which is a part of the relationship.

EXAMPLE 2   In a leader directed dimension with a related geometric tolerance frame (see Figure 2) the related_draughting_callout may be the geometric tolerance frame, where the geometric tolerance frame is being referred to the feature of size via the leader directed dimension.

NOTE 3   The role of this attribute is defined in the application protocol or the ISO 10303 integrated resource that uses or specializes this entity.

5.4.14 draughting_model   EXPRESS-G

A draughting_model is a type of representation of the shape of a product for the purpose of draughting or other presentation forms. A draughting_model may contain mapped_items that are the mappings of shape_representations or representations with geometry or of other draughting_models. A mapped_item that is the mapping of a shape_representation specifies an explicit representation of the shape of a product that is to be presented in the drawing. A mapped_item that is the mapping of another draughting_model specifies the use of a sub-model. The draughting_model may contain styled_items. These styled_items specify the style for a mapped_item that is the mapping of a shape_representation, and provide the curve_style to be used in presenting the shape_representation in the drawing. The draughting_model may contain annotation_occurrences. These annotation_occurrences specify the annotation that is placed in the same coordinate system as the shape_representation, and is projected into a view when the draughting_model is presented in a drawing.

EXPRESS specification:

*)
ENTITY draughting_model
  SUBTYPE OF (representation);
  SELF\representation.items : SET[1:?] OF draughting_model_item_select;
UNIQUE
  UR1: SELF\representation.name;
WHERE
  WR1: SIZEOF (QUERY (mi <* QUERY (it <* SELF.items | ('REPRESENTATION_SCHEMA.MAPPED_ITEM' IN TYPEOF(it))) | NOT ( SIZEOF (['PRODUCT_PROPERTY_REPRESENTATION_SCHEMA.SHAPE_REPRESENTATION', 'DRAUGHTING_ELEMENT_SCHEMA.DRAUGHTING_MODEL'] * TYPEOF (mi\mapped_item.mapping_source. mapped_representation)) = 1 ))) = 0;
  WR2: SIZEOF (QUERY (smi <* QUERY (si <* QUERY (it <* SELF.items | ('PRESENTATION_APPEARANCE_SCHEMA.STYLED_ITEM' IN TYPEOF(it))) | ('REPRESENTATION_SCHEMA.MAPPED_ITEM' IN TYPEOF(si\styled_item.item))) | (NOT (('PRODUCT_PROPERTY_REPRESENTATION_SCHEMA.SHAPE_REPRESENTATION' IN TYPEOF(smi\styled_item.item\mapped_item. mapping_source.mapped_representation)) AND (SIZEOF (QUERY (sty <* smi\styled_item.styles | (NOT (SIZEOF (QUERY (psa <* sty.styles | (NOT ('PRESENTATION_APPEARANCE_SCHEMA.CURVE_STYLE' IN TYPEOF(psa))))) = 1 )))) = 1))) )) = 0;
END_ENTITY;
(*

Attribute definitions:

items: the set of draughting_model_item_select.

Formal propositions:

UR1: The representation.name shall be unique.

WR1: Each item of a draughting_model shall be a mapped_item, styled_item, axis2_placement, or camera_model.

WR2: If there is a mapped_item in the draughting_model, the source of the mapped_item shall be a shape_representation or another draughting_model.

5.4.15 draughting_model_item_association   EXPRESS-G

A draughting_model_item_association is a type of item_identified_representation_usage. It is an identification of an annotation_occurrence or draughting_callout within a draughting_model as being an element that describes a shape_aspect or a shape_aspect_relationship.

EXAMPLE    In an application protocol, an instance of the shape_representation describes a characteristic of a product. One element of the shape_representation - a Curve - represents the boundary of a hole that is a shape_aspect in the product. This entity data type may be used to state that the curve describes the hole, in the context of the entire shape_representation describing the shape of the product.

EXPRESS specification:

*)
ENTITY draughting_model_item_association
  SUBTYPE OF (item_identified_representation_usage);
  SELF\item_identified_representation_usage.definition : draughting_model_item_definition;
  SELF\item_identified_representation_usage.used_representation : annotation_representation_select;
  SELF\item_identified_representation_usage.identified_item : draughting_model_item_association_select;
END_ENTITY;
(*

Attribute definitions:

definition: specifies the product_definition_shape, property_definition, shape_aspect, shape_aspect_relationship that is presented by the identified_item.

used_representation: specifies the area_dependent_annotation_representation, presentation_area, presentation_view, symbol_representation, view_dependent_annotation_representation containing the identified_item.

identified_item: specifies the annotation_occurrence, draughting_callout presenting the definition.

5.4.16 leader_curve   EXPRESS-G

A leader_curve is a type of annotation_curve_occurrence. A leader_curve is a draughting annotation curve which directs the eye of the reader from presented requirements or information to an intended place on the drawing. A leader_curve itself may be annotated with a terminator_symbol, such as an arrow, to indicate the point of interest.

A leader_curve shall satisfy the requirements for a leader line specified in ISO 129-1.

A leader_curve is used in a leader_directed_callout to direct the other elements of the callout to an intended place or point of interest on a drawing.

NOTE 1   Generally, a leader_curve, also known as a leader line, is a continuous thin single or multiple segment curve with a terminator symbol at one end, indicating the place of interest. Various forms of the leader curve are shown in Figure 14. Style requirements are specified in other international and national draughting practices standards.



Figure 14 —  Leader curves

Figure 14 —  Leader curves

EXPRESS specification:

*)
ENTITY leader_curve
  SUBTYPE OF (annotation_curve_occurrence);
WHERE
  WR1: SIZEOF( QUERY(ldc <* USEDIN( SELF, 'DRAUGHTING_ELEMENT_SCHEMA.' + 'DRAUGHTING_CALLOUT.CONTENTS') | 'DRAUGHTING_ELEMENT_SCHEMA.' + 'LEADER_DIRECTED_CALLOUT' IN TYPEOF(ldc))) >= 1;
END_ENTITY;
(*

Formal propositions:

WR1: A leader_curve shall be used by at least one referencing leader_directed_callout.

NOTE 2   A leader_curve always directs other information contained within a draughting_callout to a place on a drawing. Curves which do not meet this requirement should be treated as annotation curves with a referencing terminator symbol.

5.4.17 leader_directed_callout   EXPRESS-G

A leader_directed_callout is a type of draughting_callout which includes one or more leader lines to direct the eye of the reader from the other presented requirements and information to a place or places of interest on the drawing.

NOTE    An example of a leader directed callout is given in Figure 15.



Figure 15 —  Leader directed callout

Figure 15 —  Leader directed callout

EXPRESS specification:

*)
ENTITY leader_directed_callout
  SUBTYPE OF (draughting_callout);
WHERE
  WR1: SIZEOF (QUERY (l_1 <* SELF\draughting_callout.contents | 'DRAUGHTING_ELEMENT_SCHEMA.LEADER_CURVE' IN (TYPEOF(l_1)))) >= 1;
  WR2: SIZEOF(SELF\draughting_callout.contents) >=2;
END_ENTITY;
(*

Formal propositions:

WR1: A leader_directed_callout shall have at least one leader_curve in the set of draughting_callout_elements.

WR2: A leader_directed_callout shall contain some annotation other than the required leader_curve.

5.4.18 leader_terminator   EXPRESS-G

A leader_terminator is a type of terminator_symbol. A leader_terminator is a symbol indicating the place of interest on a drawing. A leader_terminator located at the target end of a leader line is used to direct the reader’s eye to the place of interest.

EXPRESS specification:

*)
ENTITY leader_terminator
  SUBTYPE OF (terminator_symbol);
WHERE
  WR1: 'DRAUGHTING_ELEMENT_SCHEMA.LEADER_CURVE' IN TYPEOF (SELF\terminator_symbol.annotated_curve);
END_ENTITY;
(*

Formal propositions:

WR1: A leader_terminator shall annotate a leader_curve.

5.4.19 projection_curve   EXPRESS-G

A projection_curve is a type of annotation_curve_occurrence. A projection_curve is a draughting annotation curve which is the result of projecting a point, curve, or surface from an image of the product shape, to a point outside that image.

NOTE 1   A projection_curve, also known as projection line, extension line, or witness line, generally has a presentation style which is thin and continuous. To accommodate various draughting practices, no restriction on presentation style has been made.provides an example of the use of two projection curves.

A projection_curve shall satisfy the requirements for an extension line specified in ISO 129-1.

NOTE 2   Figure 16 provides two examples of projection_curves. Both projection_curves extend a surface to locations beyond the outline of the depicted part. A projection curve may be combined with other curves, text, and symbols to form a projection_directed_callout.



Figure 16 —  Projection curves

Figure 16 —  Projection curves

NOTE 3   Although a projection_curve is generally not presented as a dashed pattern, it may have an invisible segment where it crosses an arrowhead. This characteristic is made possible through the use of resources provided by ISO 10303-46.

EXPRESS specification:

*)
ENTITY projection_curve
  SUBTYPE OF (annotation_curve_occurrence);
END_ENTITY;
(*

5.4.20 projection_directed_callout   EXPRESS-G

A projection_directed_callout is a type of draughting_callout which includes a projection line to direct the eye of the reader from the other presented requirements and information to the projected element of the product shape.

NOTE    An example of a projection_directed_callout is shown in Figure 17. In this figure a callout, representing a surface tolerance requirement, is directed to the surface by a projection curve, representing an extension of the surface.



Figure 17 —  Projection directed callout

Figure 17 —  Projection directed callout

EXPRESS specification:

*)
ENTITY projection_directed_callout
  SUBTYPE OF (draughting_callout);
WHERE
  WR1: SIZEOF(QUERY(p_1<*SELF\draughting_callout.contents | 'DRAUGHTING_ELEMENT_SCHEMA.PROJECTION_CURVE' IN (TYPEOF(p_1))))<=2;
  WR2: SIZEOF(SELF\draughting_callout.contents) >=2;
END_ENTITY;
(*

Formal propositions:

WR1: A projection_directed_callout shall have exactly one projection_curve in the set of draughting_callout_elements.

WR2: A projection_directed_callout shall contain some annotation other than the required projection_curve.

5.4.21 terminator_symbol   EXPRESS-G

A terminator_symbol is a type of annotation_symbol_occurrence. A terminator_symbol is a styled annotation which indicates the termination of a curve or the measurement extent and direction of a dimension.

NOTE    A terminator_symbol such as an arrow, may also be used to indicate a direction of interest (e.g., measuring direction of a dimension line or viewing direction for a line indicating the cutting plane of a section view).

A terminator_symbol shall satisfy the requirements for a terminator specified in ISO 129-1.

EXPRESS specification:

*)
ENTITY terminator_symbol
  SUBTYPE OF (annotation_symbol_occurrence);
  annotated_curve : annotation_curve_occurrence;
END_ENTITY;
(*

Attribute definitions:

annotated_curve: the curve being annotated by the terminator_symbol.

5.4.22 tessellated_annotation_occurrence   EXPRESS-G

A tessellated_annotation_occurrence is a type of annotation_occurrence for tessellated geometry.

EXPRESS specification:

*)
ENTITY tessellated_annotation_occurrence
  SUBTYPE OF (annotation_occurrence);
  SELF\styled_item.item : tessellated_geometric_set;
END_ENTITY;
(*

Attribute definitions:

item: the tessellated_geometric_set that is styled by the tessellated_annotation_occurrence.

5.5 draughting_element_schema subtype constraint definition

5.5.1 annotation_curve_subtypes   EXPRESS-G

The annotation_curve_subtypes constraint specifies a constraint that applies to instances of subtypes of annotation_curve_occurrence.

An annotation_curve_subtypes is a constraint that applies to instances of subtypes of annotation_curve_occurrence.

EXPRESS specification:

*)
SUBTYPE_CONSTRAINT annotation_curve_subtypes FOR annotation_curve_occurrence;
  ONEOF (dimension_curve,
         leader_curve,
         projection_curve);
END_SUBTYPE_CONSTRAINT;
(*



*)
END_SCHEMA;  -- draughting_element_schema
(*

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