digraph "Imposm Mapping" {
	graph [rankdir=LR ranksep=3]
		subgraph highway_polygon {
			node [fixed_size=shape "width:"=20]
				highway_polygon [shape=box]
				key_highway [label=highway shape=box]
					key_highway -> highway_polygon [label=pedestrian]
		}
		subgraph highway_linestring {
			node [fixed_size=shape "width:"=20]
				highway_linestring [shape=box]
				key_highway [label=highway shape=box]
					key_highway -> highway_linestring [label="motorway
motorway_link
trunk
trunk_link
primary
primary_link
secondary
secondary_link
tertiary
tertiary_link
unclassified
residential
road
living_street
raceway
construction
track
service
path
cycleway
bridleway
footway
corridor
crossing
pedestrian"]
		}
}