{
         "Type" : "AWS::RDS::DBSecurityGroup",
         "Properties" : {
            "GroupDescription" : "Ingress for Amazon EC2 security group",
            "DBSecurityGroupIngress" : [ {
                  "EC2SecurityGroupId" : "sg-b0ff1111",
                  "EC2SecurityGroupOwnerId" : "111122223333"
               }, {
                  "EC2SecurityGroupId" : "sg-ffd722222",
                  "EC2SecurityGroupOwnerId" : "111122223333"
               } ]
         }
      }