Data is grouped in layers. These layers get their data from a datasource. This data is styled with styles.
Some styles contain a filter expression, to restrict the application of that style to only a limited number of items within the layer. Other styles simply apply to all the data within the layer.. The layer for turning circles has a datasource which only returns highway points with the tag value "turning_circle". So the style applied there doesn't need any filter. The layers that paint the place labels and amenity icons have datasources that return data with multiple possible values for the place/amenity tag. So more selection is needed in the style applied there. -- m.v.g., Cartinus _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
