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Updated PostGIS (markdown)

ThomasG77 2012-01-07 12:13:43 -08:00
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PostGIS.md

@ -73,6 +73,7 @@ If you want to add something after the query (for example ORDER BY) you must use
## XML
If you are using XML mapfiles to style your data, then using a PostGIS datasource (with a sub-select in this case) looks like:
* *Note*: if you use a sub-select that changes the extents of your features, make sure to use `estimate_extent=false` otherwise Mapnik will return no features. Otherwise you don't need to use the `estimate_extent` or `extent` parameters at all.
```xml