How do I

[John Gentilin]

In a sequence diagram I want to represent the following steps.

Object a -> Object b

a call foo() on b

a calls buildData() on a {message to self)

an operation in buildData then calls operation goo() on b.

in the message to self, I want to attach a call to B. I can
do what I want with the recursive message but it seem
that I am using the wrong symbol to do the job.

Thanks
John G