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In this tutorial, you will build a Rails application, discuss some basics about the way that Rails works, how it's structured and how to use it, and then you'll move on to working with XML. There are a number of ways to both generate and parse XML in Ruby, and you'll look at a few of them, including REXML (Ruby Electric XML), Builder and Hpricot (Technically Hpricot is an HTML parser -- but it's fast, and works on XML, too).