$resultset->refine $queryReturns a new query which is a modification of the current query.
The existing query is augmented in the following way,
depending on the type of $query :
If $query is a hashref,
it is added as an AND restriction.
If $query is an arrayref,
it is added as a local OR restriction (which is not implemented yet).
Max Maischein, <corion@cpan.org>