Chapters: Installing Nokogiri Parsing an HTML/XML document Searching a XML/HTML document Modifying an HTML/XML document Building an HTML/XML document Ensuring well-formed markup Validating against a schema Data Extraction XPath and CSS syntax String Encoding Sanitizing HTML (advertising for Loofah) Scraping Feeds (advertising for Feedzirra) View testing (advertising for Elementor) Scraping web pages (advertising for Mechanize) More Resources Link to other resources railscasts for nokogiri and mechanize