Oracle 5.0 Reference Manual page 1001

Examples
Polygon
• On a region map,
Assertions
Polygon
• The boundary of a
that are both simple and closed) that make up its exterior and interior boundaries.
• A
Polygon
Point, but only as a tangent.
• A
Polygon
• A
Polygon
• A
Polygon
defines a connected component of the exterior.
The preceding assertions make a
12.16.2.8. Class
GeometryCollection
A
GeometryCollection
All the elements in a
(that is, in the same coordinate system). There are no other constraints on the elements of a
GeometryCollection, although the subclasses of
following sections may restrict membership. Restrictions may be based on:
• Element type (for example, a
• Dimension
• Constraints on the degree of spatial overlap between elements
12.16.2.9. Class
MultiPoint
A
MultiPoint
or ordered in any way.
MultiPoint
• On a world map, a
• On a city map, a
MultiPoint
• A
MultiPoint
• A
MultiPoint
• The boundary of a
12.16.2.10. Class
MultiCurve
A
MultiCurve
noninstantiable class.
MultiCurve
• A
MultiCurve
The OpenGIS Geometry Model
objects could represent forests, districts, and so on.
Polygon
consists of a set of
Polygon
has no rings that cross. The rings in the boundary of a
has no lines, spikes, or punctures.
has an interior that is a connected point set.
may have holes. The exterior of a
Polygon
is a geometry that is a collection of one or more geometries of any class.
GeometryCollection
MultiPoint
is a geometry collection composed of
Examples
could represent a chain of small islands.
MultiPoint
could represent the outlets for a ticket office.
MultiPoint
Properties
is a zero-dimensional geometry.
is simple if no two of its
is the empty set.
MultiPoint
is a geometry collection composed of
Properties
is a one-dimensional geometry.
LinearRing
with holes is not connected. Each hole
Polygon
a simple geometry.
must be in the same Spatial Reference System
GeometryCollection
may contain only
Point
elements. The points are not connected
Point
values are equal (have identical coordinate values).
Point
elements.
Curve
981
objects (that is,
LineString
may intersect at a
Polygon
described in the
elements)
is a
MultiCurve
objects