SLD FEATURE STYLE version 1.0.20 (2010-02-01) SLD is an OGC Standard. Copyright (c) 2001,2010 Open Geospatial Consortium, Inc. All Rights Reserved. To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ . A FeatureStyle contains styling information specific to one feature type. This is the SLD level that separates the 'layer' handling from the 'feature' handling. A Rule is used to attach property/scale conditions to and group the individual symbols used for rendering.