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|  MIL-D-89009
Encapsulation.
A set format that serves to identify data
elements.
Encoding. The assignment of bit-patterns to data types in a
computer. For example, one given bit arrangement may define an
integer data type (e.g., 2's complement, 1's complement, or
biased), whereas another may describe a character data type (e.g.,
ASCII, EBCDIC).
End node.
The terminating node of an edge.
Entity. A general term for any object that is being modeled
or defined within a database.
Entity node. One of the two node primitive types used to
represent isolated features that are zero dimensional at a
particular scale. Entity nodes are topologically linked to a
containing face when face topology is present. Entity nodes can
reside at any location, whether or not there is another primitive
at that same location.
Escape sequence. A special character code used to extend the
characters used in a character code table.
Face. A region enclosed by an edge or set of edges. Faces
are topologically linked to their surrounding edges as well as to
the other faces that surround them. Faces are always
nonoverlapping, exhausting the area of a plane.
Feature. A model of a real world geographic entity. A
zero-, one-, or two-dimensional entity of uniform attribute scheme
from an exhaustive attribute distribution across a plane, or a set
of such entities sharing common attribute values. The three
subtypes are simple features, complex features, and text features.
The types of simple features are point features, line features,
and area features.
Feature attribute.
A property of a feature.
Feature class. A set of features that shares a homogeneous
set of attributes. A feature class consists of a set of tables
that includes one or more primitive tables and one or more
attribute tables. A feature class has the same columns of
attribute information for each feature. Every feature class has
one and only one feature table. The three types of feature
classes are the simple feature class, complex feature class, and
text feature class. The types of simple feature classes are the
point feature class, line feature class, and area feature class.
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