dependencies[] for macros

Hi there,

I'm wondering about the dependencies[] section that moinmoin macros 
include to declare how they should be cached.  I understand that 
Dependencies = ["time"] means that a macro will not be cached, but I see 
that StatsChart.py uses Dependencies = ["time24:00"].

Two questions:
  * presumably ["time24:00"] means refresh once per day, but I couldn't 
find anywhere in the codebase that uses this - is this part of the cache 
system magic?
  * if so, I'd like to update 
http://moinmoin.wikiwikiweb.de/macro/FeedParser, and part of this would 
be to include some caching for parsed rss feeds.  Is it possible to say 
that a macro should be recalculated (say) every two hours?

Thanks,
Jim




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