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Support Layout and Format nodes in text and shield symbolizers #358
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This update reads information about symbolizer child elements from mapnik-reference. This information is used to create child elements in the XML, based on psuedo element syntax parsed from mss. Rendering of tags for symbolizers and child elements is similar, so the rendering is handled by a new shared object called RenderNode. This also handles indentation for nested child nodes.
Three primary test focuses: 1. Rendering nested pseudo elements and properly handling indentation 2. Ordering of the child elements in the symbolizer, based on order from mapnik-reference and indexes from mss syntax 3. Handling override and inheritance of child elements and their attributes from rule to rule
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This is a potential update for review. The goal to support definition of layout and format nodes in carto, as discussed in #347. Pseudo-element sytax is used to create child elements within the symbolizers. Test cases are included, which demonstrate the syntax and resulting xml.
Note that this also requires a change in mapnik-reference: mapnik/mapnik-reference#62.