Excellent subject, but the write up, while well intended, tries to summarize too much information. For most folks, I doubt if they would even bother trying to match up the information into the functional example to really understand much. The foo:bar example really needs expanding and perhaps revised to apply to the example that is initially displayed at the beginning of the article. This article is intended as an application article or an explanation/resolution article. Either way, it misses the mark as it really does not bring the reader forward in logical steps that make sense without further research into the topic. My 2 cents...