2011

object data Attribute data attached to an object and stored in the drawing
file. Compare with
external data (page 2062).
OGC Open Geospatial Consortium. A non-profit, international, voluntary
consensus standards organization that leads the development of standards for
geospatial and location based services. (www.opengeospatial.org)
one-to-many join A join in which one record in the primary table corresponds
to more than one record in the secondary table.
one-to-one join A join in which one record in the primary table corresponds
to one record in the secondary table.
OpenGIS Agent The component of the MapGuide Server Web Extensions
that implements several OpenGIS Web-mapping protocols to expose the
services offered by the MapGuide Server to standards-based OpenGIS clients.
Oracle schema See
schema (page 2073).
Oracle Spatial (OSE) feature An earlier version of the Feature Data Objects
(FDO (page 2062)) feature, used to store maps in Oracle Spatial.
OSGeo Open Source Geospatial Foundation. A foundation created to support
and build the highest-quality open source geospatial software. The goalof the
foundation is to encourage the use and collaborative development of
community-led projects. (www.osgeo.org)
overlay To create a new topology by combining elements of two distinct
topologies. At least one of the original topologies must be a polygon topology.
overlay analysis In AutoCAD Map 3D, a tool that provides spatial and data
analysis capabilities for two sets of geospatial features.
package In MapGuide, a compressed file that can speed up the process of
loading data onto the server. Large source-data files can be zipped up in this
file format and saved to a network location or copied to a CD.
parallel A degree of latitude that circles the earth parallel to the Equator.
path trace For a network topology, a trace begins at a specified point, finds
the shortest distance to another point and is based on resistance (the length
by default).
persistent locking The ability to edit checked-out objects while you are offline,
and then save your changes back to the data source when you return online.
placeholder Specifies location and size of elements (viewports, scale bar, north
arrow, legend) in a map sheet.
2070 | Glossary