mapnik/mapnik — pull request #1338 by jhollinger2 (2012-07-23 13:15:30+00:00)
Title: group symbolizer

GroupSymbolizer has been added, currently supported in the agg renderer. It is designed for displaying multiple shields along a single line geometry. Group symbolizer contains child rules and symbolizers to match to each set of attributes, and a layout manager to arrange them. Ability to define offsets within the format tree of text symbolizer has also been added.