What is a Map Style ?  Building on GML and SVG.

The introduction of standard grammars for the description of geography (GML) and graphics(SVG) has paved the way for a standard grammar for the description of map style. A map style can be defined as a set of rules that map geographic objects (described in GML) into graphic objects (described in SVG). It does not matter that the storage model and display models use or not either GML or SVG.  The paper explores the requirements for a style grammar and reviews public grammars developed in the OGC including GML Default Styling and Styled Layer Descriptor.  Examples of styling of topology, geometry and time dependent data will be discussed.