Polygon

Is Abstract: 
no
Is Pattern: 
no
Definition: 

A closed plane figure bounded by three or more line segments, representing a geographic area. Contains either the URI of the file containing the polygon, a specific link code for the shape within the file, and a file format, or a minimum of 4 points to describe the polygon in-line. Note that the first and last point must be identical in order to close the polygon. A triangle has 4 points.

Property: 
NameCardinalityDatatypeDescription
uri
0..1
A URI for the boundary file containing the polygon
polygonLinkCode
0..1
The PolygonLinkCode is the identifier of the specific polygon within the file. For example in an NHGIS file the LinkCodeForPolygon for Tract 101.01 in Hennepin County in Minnesota is 2700530010101.
shapeFileFormat
0..1
The format of the shape file existing at the location indicated by the sibling ExternalURI element.
point
4..n
A geographic point defined by a latitude and longitude. A minimum of 4 points is required as the first and last point should be identical in order to close the polygon. Note that a triangle has three sides and requires 3 unique points plus a fourth point replicating the first point in order to close the polygon.
Relationship: 

Stage:

DDI 3.2: 
r:PolygonType
Is extendable: 
Is property: 
1
RDF Mapping: 

Comments

For non-XML formats that do not by default store the order of elements, the five or more points are not distinctively define an polygon without storing the order of the points.

Polygons have valid dates. These seems to have been dropped from the structure