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16.3.1 Well-Known Text (WKT) Format
-----------------------------------
The Well-Known Text (WKT) representation of Geometry is designed to
exchange geometry data in ASCII form.
Examples of WKT representations of geometry objects:
* A `Point':
POINT(15 20)
Note that point coordinates are specified with no separating comma.
* A `LineString' with four points:
LINESTRING(0 0, 10 10, 20 25, 50 60)
Note that point coordinate pairs are separated by commas.
* A `Polygon' with one exterior ring and one interior ring:
POLYGON((0 0,10 0,10 10,0 10,0 0),(5 5,7 5,7 7,5 7, 5 5))
* A `MultiPoint' with three `Point' values:
MULTIPOINT(0 0, 20 20, 60 60)
* A `MultiLineString' with two `LineString' values:
MULTILINESTRING((10 10, 20 20), (15 15, 30 15))
* A `MultiPolygon' with two `Polygon' values:
MULTIPOLYGON(((0 0,10 0,10 10,0 10,0 0)),((5 5,7 5,7 7,5 7, 5 5)))
* A `GeometryCollection' consisting of two `Point' values and one
`LineString':
GEOMETRYCOLLECTION(POINT(10 10), POINT(30 30), LINESTRING(15 15, 20 20))
A Backus-Naur grammar that specifies the formal production rules for
writing WKT values can be found in the OpenGIS specification document
referenced near the beginning of this chapter.
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