multiple attributes

[Sven N. Thommesen]

Imagine a heatbugs-based application, but one where you want 
a (possibly large) number of attributes for each world grid 
site.

Does anyone have an opinion as to what would be more efficient,
having multiple 'heat spaces', or coding a new kind of space 
where each site points to a LIST of attributes (e.g. a list of
integers) ? 

I know the first alternative is doable (I currently have 3 spaces),
but slow. Has anyone made any attempts toward the second alternative?

Sven