{
  "Type" : "AWS::RDS::DBCluster",
  "Properties" : {
    "MasterUsername" : { "Ref" : "username" },
    "MasterUserPassword" : { "Ref" : "password" },
    "Engine" : "aurora",
    "DBSubnetGroupName" : { "Ref" : "DBSubnetGroup" },
    "DBClusterParameterGroupName" : { "Ref" : "RDSDBClusterParameterGroup" }
  }
}