- get "relation/:id/relations" => "api/relations#relations_for_relation", :id => /\d+/
- get "relation/:id/history" => "api/old_relations#history", :id => /\d+/
- get "relation/:id/full" => "api/relations#full", :id => /\d+/
+ get "relation/:id/relations" => "api/relations#relations_for_relation", :id => /\d+/, :defaults => { :format => "xml" }
+ get "relation/:id/history" => "api/old_relations#history", :id => /\d+/, :defaults => { :format => "xml" }
+ get "relation/:id/full" => "api/relations#full", :id => /\d+/, :defaults => { :format => "xml" }