How to send feeds properly?

I want browser read whole file, only if it has new entries.

I read data from the database. Limit result to 15 items.
Then create an array and pass it to the Zend_Feed.

Shall I cache the above steps with Zend_Cache + very long lifetime,
and use a cache tag, clean cache entries by tag when new article is posted?

Then, is it enough to use send() method?
Do browsers read last-modified entry from the feed itself,
or only from the HTTP headers?

-- 
regards
takeshin

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