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|  MIL-D-89009
TABLE 2.
Field and key types implemented in the DCW.
Field
Description
Key
Description
Type
Type
K
ID triplet
P
Primary key
I
Long Integer
F
Foreign key
S
Short Integer
N
Non-key
T<n>
Fixed-length text string
T*
Variable-length text string
C
Coordinate pair (x, y)
C<n>
Coordinate array
C*
Coordinate string
D
Date
X
Null column
3.8.1
Database-level record layout. The DCW is one database
with five libraries. Two mandatory VPF files are implemented at
the database level:
a. Database header table. This table contains information
about the contents of the database and security
information. The format and content for the database
header table are presented in TABLE 4.
b. Library attribute table. The library attribute table
(TABLE 5) contains six columns; the row id, the name,
and the extent for each library in the database. The
format and content of the library attribute table is
presented in TABLE 5.
3.8.2
Library-level record layout DCW libraries must
contain the same minimum set of required VPF files; however, they
do not need to contain the same thematic layers or coverages. The
library names are also the directory names and are represented in
capital letters. The thematic layer names and coverage names for
the DCW libraries are listed in TABLE 1. The contents of the DCW
libraries are described in 3.8.3. The contents of the BROWSE
library are described in 3.8.4.
3.8.3
DCW library contents. The DCW libraries are
directories containing VPF tables, thematic coverages, and
reference coverages. A detailed description of library contents
is available in the Military Standard for Vector Product Format,
MIL-STD-60006. There are three mandatory VPF tables: library
header table, geographic reference table, and coverage attribute
table, and two tables: data quality table and a lineage narrative
table. There are 17 coverage subdirectories, each of which
contains a thematic coverage. The thematic coverages are listed
in the coverage attribute table. There are three additional
coverage subdirectories in the DCW library: the name placement
12
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