<description>Styled Layer Descriptor version 1.1.0 (2010-02-01)</description><copyright>SLD is an OGC Standard. Copyright (c) 2007,2010 Open Geospatial Consortium, Inc. All Rights Reserved. To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ .</copyright>
Usually references the definition of a CRS, asspecified in [OGC Topic 2]. Such a CRS definition can be XML encodedusing the gml:CoordinateReferenceSystemType in [GML 3.1]. For wellknown references, it is not required that a CRS definition exist atthe location the URI points to. If no anyURI value is included, theapplicable CRS must be either: a) Specified outside the bounding box,but inside a data structure that includes this bounding box, asspecified for a specific OWS use of this bounding box type. b) Fixedand specified in the Implementation Specification for a specific OWSuse of the bounding box type.
The number of dimensions in this CRS (the length of acoordinate sequence in this use of the PositionType). This number isspecified by the CRS definition, but can also be specifiedhere.