MIL-PRF-28000B
3.2.2 Class 2 - engineering drawing subset. This engineering drawing subset of IGES shall be used to encode
product data being acquired for delivery in digital form. Exchange emphasis is on completeness, visual
equivalency for human interpretation, and functionality of the received drawing model, including the requirements
of style and content for the document used to develop the drawing.
3.2.2.1 File construction.
3.2.2.1.1 Start section. The following information shall be given in the start section of the file:
a.
Statement of conformance to this application subset, the applicable revision level of this
specification, and the release date of the latest amendment to this specification (or date of the
latest revision if no amendment has been issued).
b.
Revision letters of most recent change to each drawing sheet in the file.
c.
Performing organization, date of the IGES file preprocessing and contract number.
d.
Intended drawing size letter and number of drawing sheets in this file.
e.
Data organization method with contents of each level, for example:
Level
Description
1
model entities
201
dimension
202
crosshatching
3.2.2.1.2 Global section. Fields in the global section shall be restricted to certain ranges. Defaulted values shall
be interpreted as "unspecified" except as noted in table III for global parameters 1, 2, 12, and 24.
TABLE III. Global section field ranges for Class 2 (Engineering Drawing Subset)
Field
Value
Required
Default/Notes
1
,
N
Default to ,
2
;
N
Default to ;
3-11
Y
12
N
Default to field 3
13
1.0
Y
14
1-11
Y
15-17
Y
18
Y
The year must be shown as YYYY
19
Y
20
N
21
Y
22
Y
23
11 or greater
Y
24
0-7
N
Default to zero
10
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