The documentation on Stored procedures in Mysql version 5, does not look good or professional like any other product. One got to really wait to know on that until they update the documentation.
May be you can search for that in the Master DB, if not there, it is better to do some research on that on our own. It is hard to find anything from documentation on your query.
Will keep you posted, if found any progress.
Cheers!
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-Vijay G
Strive for Perfection