Hi,

I've run across a few patterns in URLs where applying a normalization puts
the URL in a form matching another normalization pattern (or even the same
one). But that pattern won't get executed because the patterns are applied
only once.

Should normalization iterate until no patterns match (with, perhaps, some
limit to the number of iterations to prevent loops from pattern mistakes)?

It's a minor problem; it doesn't seem to affect too many URLs for things
like session ID removal, since finding two session IDs in the same URL is
rare (but does happen -- that's how I noticed this). I could imagine it
being much more significant, however, if other Nutch users out there are
using "broader" normalization patterns.

Any philosophical/practical objections? (it's early, I've only had 1 coffee,
and I've probably missed something obvious!) 

I'll file an issue and add it to my queue of things to do if people think
its a good idea.

-Doug
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