MIL-D-89009
Coverage attribute. A property of a coverage. The coverage
attribute table contains properties for all coverages in the
library.
Cross-tile topology. The encoding of topological
relationships in such a manner that those relations are maintained
even when a coverage has been physically partitioned into multiple
tiles.
Data dictionary. A collection of tables with entries that
define the meaning of attributes and the allowable values (or
ranges of values).
Data structure.
The physical structure used to represent the
data model.
Data syntax. A description of the computer-readable (bit-
level) representation of data.
Database. A collection of related libraries as defined by a
product specification.
Database attribute.
A property of a database.
Date status. Date status refers to the date at which the
data was introduced or modified in the database. This date of
entry is used as a proof of modification for a single data element
and permits the statistical interpretation of groups of data
elements.
Direct access. Retrieval of data by reference to its
location on a storage medium rather than relative to the
previously retrieved data. The access mechanism goes directly to
the data in question. This access method is normally required for
online data usage.
Directory. A file that contains a list of the unique names,
file types (directory or table), beginning addresses, and lengths
of other files.
Edge. A one-dimensional primitive used to represent the
location of a linear feature and/or the borders of faces.
Depending upon the level of topology, edges may be topologically
linked to nodes, edges, and faces. Edges are composed of an
ordered collection of two or more coordinate tuples (pairs or
triplets). At least two of the coordinate tuples must be
distinct. The orientation of an edge can be recognized by the
ordering of the coordinate tuples.
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