MIL-PRF-28000B
Field
Value
Required
Default/Notes
25
N
If date is provided, the year must be
shown as YYYY
26
23HMIL-PRF-28000B0,CLASS 2
Y
3.2.2.1.3 Directory Entry (DE) section. See notes for table IV for restrictions placed on the values in the DE
section. In addition, the following capabilities shall be provided and shall be supported for all entities as
required by IGES. IGES defines the actions of the preprocessors and postprocessors for the DE section values
on an entity specific basis:
a.
Line font pattern.
b.
The level number field shall be zero or positive except where necessary to maintain the meaning
of the referenced entity.
c.
View pointer.
d.
Translation matrix.
e.
Blank status flag.
f.
Subordinate entity switch.
g.
Entity use flag.
h.
Hierarchy status flag.
i.
Line weight number.
j.
Color number.
k.
Form number.
3.2.2.1.4 Parameter Data (PD) section. See notes for table IV for restrictions placed on the parameters in the
PD section.
3.2.2.2 Information requirements and data functionality. Currently, engineering drawings form the mainstay of
product definition and form the accepted medium for viewing computer-generated data. Geometry and
annotation entities form the majority of data items. Extensive use is made of dimensions, sectioned areas, text
notes, and feature control symbols. Non-geometric information in the form of color, line weight, line font, and
level is needed as well. Finally, relationships among the data help to structure the large quantities of data.
Information requirements for this application subset include (but are not limited to):
a.
Simple geometry in the form of points, lines, circular arcs, conic arcs, and spline curves.
b.
Non-geometric attributes of color, line weight, and line font.
11
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