Just providing a cross-reference here. I asked for clarification on this issue, but ended up getting the answers through experimentation.
If one creates a stored procedure that always returns a known number of result sets (probably good practice to do this anyway), the only difference to the "traditional" usage of DBI is that you need to call $sth->more_results() before retrieving each new set (otherwise you don't get the new set.)
So, this means that $sth->more_results() doesn't just mean "are there more results?" but is also the command to retrieve the next result set.
Please see the node I have referenced above for examples.
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