def to_params
      params = {}
      qualifications.each_with_index do |qualification, i|
        qualification.to_params.each_pair do |k,v|
          params["QualificationRequirement.#{i+1}.#{k}"] = v
        end
      end
      params
    end
def to_params
      params = {}
      qualifications.each_with_index do |qualification, i|
        qualification.to_params.each_pair do |k,v|
          params["QualificationRequirement.#{i+1}.#{k}"] = v
        end
      end
      params
    end
For more information about qualification requirements see:
 http://docs.amazonwebservices.com/AWSMturkAPI/2008-08-02/index.html?ApiReference_QualificationRequirementDataStructureArticle.html