I'm a freshman learning about the nutch. Here,I have serval questions: 1、URLNormalizer is a kind of a ExtensionPoint.But why does it implement the Pluggable as other extensionpoint does?And further-more,do any difference exist between the URLNormalizer and the other ExtensionPoint leading the URLNormalizer's not implementing the Pluggable? 2、while URLNormalizer not implementing the Pluggable,everything seems to work well.So,I wonder whether it is necessary to make the extensionpoint implement the Pluggable?
Is it a bug or a specified trick? Waiting for ur answer.And thank u!
