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Better yet: Is there a well defined structure for other folks to add that stuff?

I'm not one of the authors, but the code in question is all in one file: https://github.com/clips/pattern/blob/master/pattern/web/__i...

It would be fairly straightforward to add your own class.

Whoa, modules with dozen of classes and 2450 lines of code! They definitely don't rely on file-navigation.

Project is great, but I've got a feeling that many smallish components have been already implemented, but here they were rewritten from scratch.

Is it just me or are they rerlolling requests and lxml for no good reason?

The source code has a base SearchEngine class and a Result class, which streamline the input and output parameters across different web services, so it is not difficult to add new services (= subclass of SearchEngine). There are also some general developer docs: http://www.clips.ua.ac.be/pages/pattern-dev

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