The Style Layer Descriptor is an encoding for how the Web Map Server WMS 1.0 & WMS 1.1 specification can be extended to allow user-defined symbolization of feature data.
| Data | Version | Link |
|---|---|---|
| 2002-08-19 | 1.0 | http://www.opengis.org/docs/02-070.pdf |
For a great tutorial on the Geotools implementation of SLD: