using a DS with a stored procedure

I'm looking at using a stored procedure (which references an existing
RPGLE program) for connecting to an external process. I would need to be
able to send multiple rows.

We have a windows app that would call a stored procedure and pass it
approximately 59 fields of data, but it can contain up to 99 rows of data.

Is this even possible? I was thinking of just defining the full length of
the data structure and using that as a clob field or something along that
lines but it doesn't sound very efficient.

Websphere and a web service is not an option, the owner flat out shot down
spending the money for that. So I'm back to square one.