MIL-PRF-28000B
3.2.1 Class 1 - technical illustration subset. The technical illustration subset of IGES addresses entities that
support the exchange of figures and illustrations normally found in a technical publication. In this application,
emphasis is on the visual clarity of figures and illustrations designed for human interpretation. NISTIR 4379
provides additional guidance on this usage of IGES.
3.2.1.1 File construction.
3.2.1.1.1 Start section. The following information shall be placed 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.
Illustration number or identifier.
3.2.1.1.2 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 I for global parameters 1, 2, 12, 15, and 24.
TABLE I. Global section field ranges for Class 1 (Technical Illustration Subset)
Field
Value
Required
Defaults/Notes
1
,
N
Default to ,
2
;
N
Default to ;
3-6
Y
7-11
N
12
N
Default to field 3
13
1.0
Y
14
1,2,4-11
Y
15
N
Default to 1
16-17
Y
18
Y
The year must be shown as YYYY
19
Y
20
N
21
N
22
N
23
11 or greater
Y
24
0-7
N
Default to zero
25
N
If date is provided, the year must be
shown as YYYY
26
23HMIL-PRF-28000B0,CLASS 1
Y
3.2.1.1.3 Directory Entry (DE) section. See Notes in Table II for restrictions placed on the values in the DE
section.
3.2.1.1.4 Parameter Data (PD) section. See Notes in Table II for restrictions placed on the parameters in the
PD section.
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