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Aggregation of RSS Feeds

From: jamesjacobyu@-----.---
To: NULL
Date: 3/3/2006 9:46:00 AM
Not sure if this is the best place to ask this question, but here goes:

I'm programming an aggregator that keeps track of a large number of
feeds (basically an rss reader). The problem is, I want an automatic
way to know when sites have updated, so my program doesn't have to keep
checking all the feeds to see if they've updated.

I know that there are ping servers that blogs ping when they've
updated, like blo.gs and weblogs.com. But, I am unsure about how to use
this to my advantage. Can anyone point me in the right direction?

Also, does anyone know if RSS XML docs have a way to query them for the
last updated time? That way, I don't actually have to download the
whole doc to see if its updated (I know HTML has this capability).

Thanks,
James



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