"caravan_site"=>"reception","fee"=>"yes","internet_access"=>"wlan","sanitary_dump_station"=>"yes","source:date"=>"2016-04-10"
"campers"=>"yes","caravans"=>"yes","dog"=>"yes","fee"=>"yes","internet_access"=>"wlan","power_supply"=>"yes"
"dog"=>"no","fee"=>"yes","internet_access"=>"wlan","power_supply"=>"yes"
"fee"=>"yes","internet_access"=>"wlan","power_supply"=>"yes","sanitary_dump_station"=>"yes"
"cabins"=>"yes","campers"=>"yes","fee"=>"yes","internet_access"=>"yes","power_supply"=>"yes","tents"=>"yes"