"board_type"=>"geology","information"=>"board"
"bicycle"=>"yes","information"=>"map"
"board_type"=>"history","information"=>"board"
"information"=>"yes","operator"=>"Stichting dorpshuis 't Griffioentje","source:date"=>"2014-02-11"
"board_type"=>"nature","information"=>"board","operator"=>"Staatsbosbeheer"