{ "Route53" : {
    "Type" : "AWS::Route53::RecordSetGroup",
    "Properties" : {
      "HostedZoneName" : {"Ref" : "Route53HostedZoneName"},
      "RecordSets" : [
        { "Type" : "AWS::Route53::RecordSet",
          "Properties" : {
            "Name" : {"Fn::Join" : [ "", "app.", [{"Ref" : "URLSubfix"}] ]},
            "Type" : "A",
            "AliasTarget" : "AppELB"
          }
        }
      ]
    }
  }
}