How to crawl only a specific type of files?

[盖世豪侠 <ma...@gmail.com>]

Nutch always crawls from from a parsed file to the urls contained in the
file. However, if we want to crawl a specific type of files (e.g. rss file),
there may be some difficulties. As the links to real rss files are always
contained in some entry files of html/htm, so there is no direct urls from
one rss file to another. If we want to index rss files, we have to index
many html/htm files first.

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