Thanks a lot, I have made a look in these classes. But what I exactly want to do is to detect if a Document(in the index of solr)has changed when I recrawl a site with Nutch. Not to block deduplication, but to detect if a Document has changed and extract changes in a file without writing them over the old Document. After that I decide wether to rewrite the Document or to keep both of them the old and the new one. I wish I am more precise. Thanks and permit my poor english.
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