[Tagging] A second step towards bringing the wiki and tool support closer together
cartinus at xs4all.nl
Thu Dec 10 06:13:14 GMT 2009
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.
More information about the Tagging