I'm looking for a data-structure with these attributes:

• It behaves like a multidimensional hash, so you can store / get data like this:  $sales(region=>'north', date=>'1-1-99', type=>'gross', channel=>'web')
• It checks its dimensions (all valid values provided at creation), so
   $sales(region=>'bogus-region', date=>'1-1-99', type=>'gross', channel=>'web') would fail (bad region), as would
   $sales(region=>'south', date=>'1-4-99', type=>'gross') (missing channel)
• It provides for dimensional 'reductions' like this:
   my $reduced = $sales->reduce([qw(region date)], \&mysum),
  which would yield a new reduced object with data summed over region and date (eg the reduced object would have dimensions of type and channel)
• It provides for dimensional 'transforms', such as
   my $reduced = $sales->transform([qw(date)], \&mynormalize),
  which would yield a new object normalized (eg %) by date within each channel, region, and type

Anyone seen anything like this go by? It is sort of a datacube in perl. Thanks in advance for any ideas.

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