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It is an expression type that has been refined and simplified to use for file system paths.
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It allows normal, static paths like `/path/to/file.png` but also dynamically constructed paths like: `/path/to/[field].png` so that for every symbolizer rendered the image/svg file path lookup would change depending on the value of a given data field, in this case an attribute called `field`.
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For more info see: http://mapnik.org/news/2009/12/08/future_mapnik2/ |
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