2011

link (external databases) The connection between a drawing object and its
related database data. The link data is stored on the linked drawing object and
contains the name of the link template and the key value used to identify the
associated record in the linked table. An object may have more than one link.
link (geometry) An element of geometry that connects nodes. In a polygon
topology, a link defines a polygon edge. Links can contain vertices and true
arcs, and can be represented as a line, polyline, or arc. See also
node (page 2069).
link template A data structure that contains the path information to a database
table and specifies one or more key fields in that table.
lock To make all or part of a disk file read-only so that it cannot be modified
by other users on a network. Object locking applies to objects that are being
edited by another user. File locking applies to entire files, for example when
an AutoCAD user wants to open a file while the file is being edited in AutoCAD
Map 3D.
logical operator A symbol such as And, Or, Not, =, >, >=, <, and <= used to
define logical relationships.
long transaction Transactions that extend over hours, days, or months, unlike
the more typical database transactions that last for only seconds. Long
transactions support atomicity, consistency, and durability, and can be
committed or rolled back.
longitude The second part of a spherical coordinate system used to record
positions on the earths surface. Longitude measures angular distance east or
west of the prime meridian, which runs through Greenwich, England. See
also
latitude (page 2066).
main viewport The viewport that represents a map tile in a sheet. See also
viewport (paper space) (page 2078).
map A collection of layers displayed within a consistent coordinate system
and extents. See also layer (page 2066).
Map Book Manages your
map book (page 2067) and contains commands for
creating, editing, and publishing them. To view Map Book, click its tab in the
Task Pane (page 2076).
map book A publishing option that divides a map into tiles and formats them
into pages with a legend and an index/key. Create and edit map books from
the Map Book tab in the
Task Pane (page 2076).
map book template A special type of sheet set template used by a map book
to generate sheets. The map tiles are generated based on the layout and
viewport placeholder properties.
Glossary | 2067