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### 18.3.1. 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.

 Published under the terms of the GNU General Public License Design by Interspire