Basic poi layer

layers/poi/poi.yaml

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+layer:
+  id: "poi"
+  description: |
+      POIs.
+  buffer_size: 8
+  srs: +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over
+  fields:
+    class: String
+  datasource:
+    geometry_field: geometry
+    srid: 900913
+    query: (SELECT geometry, name, name_en, class, subclass FROM layer_poi(!bbox!, z(!scale_denominator!))) AS t
+schema:
+  - ./class.sql
+  - ./layer.sql
+datasources:
+  - type: imposm3
+    mapping_file: ./mapping.yaml