"board_type"=>"nature","information"=>"board"
"information"=>"office","source:date"=>"2014-03-24","addr:country"=>"NL"
"map_size"=>"site","map_type"=>"street","information"=>"map"
"board_type"=>"history","description"=>"De nog enig bewaarde NAM concessiepaal","information"=>"board"