INTRODUCTION
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Sorry, this was so completely deprecated that I figured out deleting
it is a better idea. Here's how to understand RSSKit:

Read the RSSArticleProtocol.h, RSSFeedProtocol.h, RSSFactory.h files.
They will give you a hint on how to use RSSKit. You can write your own
concrete factory to make use of RSSArticle subclassing easier.