MIL-PRF-28000B
c.
Data relationships, including the concept of subfigures.
d.
Data organization methods such as level.
e.
Part name, drawing number, formal identification, and drawing revision.
f.
Annotation entities represented by the corresponding IGES entity type thus retaining its intended
functionality.
3.2.2.3 Data accuracy requirements. All data transformations shall maintain an accuracy of 1.0 x 10- 6 units on
all parametric and coordinate values and all measurable dimensions.
3.2.2.4 Mapping of information content to IGES subset entities. Engineering drawing geometry shall be
mapped into IGES geometry entities and organized as necessary with the composite curve, subfigure definition,
and subfigure instance entities. Text shall be represented by the general note entities and shall not be
represented as geometry. Geometry that also happens to be text, such as a company's logo printed on a PC
board, is not held to this restriction. Annotation entities shall not be represented as geometry. Use of IGES
constructs such as the dotted line font (DE field 4-5) is encouraged to reduce file lengths (see 6.4).
3.2.2.5 User conventions and data organization. A minimum complexity drawing and view entity combination
shall be used to assure a part model being created on all destination systems. A drawing size property shall be
used to define drawing limits. As specified in the contract or other form of agreement, data shall be organized
as one drawing per file with multiple sheets permitted, or shall be restricted to one sheet per file.
3.2.2.6 IGES entity subset specification. Table IV lists the entities of this subset. Only IGES entities which are
enumerated in this table shall be used for representing engineering drawing product definition data. Other valid
IGES entity types may be present in the file as described by 3.1.1. Additional requirements are placed on the
global section of a file, and certain field value restrictions are placed on the range of parameter values in both the
DE and the PD sections of a valid IGES file.
TABLE IV. IGES entity content for Class 2 (Engineering Drawing Subset)
ENTITY
FORM
ENTITY NAME
DE
PD
NOTES
NOTES
0
Null
100
Circular Arc
1
102
Composite Curve
1
2
104
1
Conic Arc
1
5
104
2
Conic Arc
1
5
104
3
Conic Arc
1
5
106
11
2D Linear String
1
6
106
12
3D Linear String
1
6
106
20
Centerline Through Points
1
106
21
Centerline Through Circle Centers
1
106
31
Section (parallel line segments)
1
106
32
Section (parallel line segments in pairs)
1
12
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