"operator"=>"Amsterdamse Waterleiding Duinen","information"=>"map"
"board_type"=>"toegandsbord AWD; geen gate hier, maar opening in fence","information"=>"board"
"information"=>"map","map_type"=>"topo"
"board_type"=>"historical","description"=>"crash site of Britse Halifax NA 347 on April 13 1945","information"=>"board"
"information"=>"office","source:date"=>"2014-02-11","addr:country"=>"NL"