[mkgmap-dev] Relations and roles

Fri Jul 3 22:21:42 BST 2009

I want to show road signs for restrictions. So I tried the following:

relations:
type=restriction { apply { set relation_restriction='${restriction}' }}

points:
relation_restriction=only_straight_on [0x300f level 0]

This creates a sign at the crossing. But I'd prefer to see the sign at the
'from' part of the relation. So I added the following line to the file
polygons:
relation_restriction=only_straight_on [0x21 level 0]

In this case I get 3 signs for every restriction (from, via, to). (This is a
'hack' to get a POI for a way with --add-pois-to-areas. The polygon is not
displayed because the way consists of 2 nodes).

How can I restrict the POI to the 'from' member of the relation? The
following line doesn't work because 'role' doesn't belong to the relation,
it belongs to the members of the relation:

type=restriction & role=from { apply { set
relation_restriction='${restriction}' }}

Rudi