Expirations

One thing I've encountered while working for Yahoo Multimedia Search 
is that media often expires. Especially when considering News media.

I couldn't really find much information on RSS addressing notions of 
expirations, and was wondering if people could point me towards 
possible solutions. 

We could always roll our own with some generic format... but would 
prefer to use what's most widely adopted.

Thanks-
David








 
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