API-changes-between-v3.0-and-v3.1.md

+Compiler must now support c++14 to build Mapnik 3.1.x
+
+## Removed
+
+TODO
+
+## Changed
+
+ - PostGIS: Variables in postgis SQL queries must now additionally be wrapped in `!` (refs [#3618](https://github.com/mapnik/mapnik/pull/3618)):
+```sql
+-- Mapnik 3.0
+SELECT ... WHERE trait = @variable
+
+-- Mapnik 3.1
+SELECT ... WHERE trait = !@variable!
+```
+
+ - PostGIS & PGraster: The `table`/`geometry_table`/`raster_table` parameter in XML style must be quoted if it would need quoting in SQL query (for example if it's a reserved word or multiple words; refs [#3618](https://github.com/mapnik/mapnik/pull/3618)):
+```xml
+<!-- Mapnik 3.0 -->
+<Parameter name="geometry_table">rolling stones</Parameter>
+
+<!-- Mapnik 3.1 -->
+<Parameter name="geometry_table">"rolling stones"</Parameter>
+```
+
+- `load_map()` with `strict=true` throws an exception on duplicate style names (refs [#3770](https://github.com/mapnik/mapnik/pull/3770), [#3917](https://github.com/mapnik/mapnik/pull/3917)).
+
+## Added
+
+ - PGraster: Variable interpolation just like PostGIS plugin (refs [#3618](https://github.com/mapnik/mapnik/pull/3618)).
+ - PostGIS & PGraster: Datasource parameter `application_name` (refs [#3984](https://github.com/mapnik/mapnik/pull/3984)).
+ - Geobuf input plugin (refs [3715](https://github.com/mapnik/mapnik/pull/3715)).
+ - Layers can be nested, `comp-op` and `opacity` on Layer level are supported (refs [3474](https://github.com/mapnik/mapnik/pull/3474)).
+ - `extend` option of TextSymbolizer (refs [3512](https://github.com/mapnik/mapnik/pull/3512)).
+ - Text simple placement `C` for no displacement (refs [#3596](https://github.com/mapnik/mapnik/pull/3596)).
+ - `angled-point` placement of MarkersSymbolizer (refs [3782](https://github.com/mapnik/mapnik/pull/3782)).
+
+TODO
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