Semantic HTML elements are those that clearly describe their meaning in a human- and machine-readable way. Elements such as <header>, <footer> and <article> are all considered semantic because they accurately describe the purpose of the element and the type of content that is inside

A Creative Commons handbook that teaches the legal, social, and technical aspects of open data. Teaches not only what you can do with an open data set, but how to go about getting datasets opened to analysis. If you're looking for a hands-on nitty-gritty book about mining open data, however, this isn't it.