The Extensible Markup Language (XML) is widely used for Web design and authoring, and its uses go far beyond the confines of the Internet. It is a versatile metalanguage that is spreading across many different industries. XML.org is one of the best resources of XML information for curious beginners or advanced users. For the first group of people, there are plenty of frequently asked questions lists, tutorials, and articles to get started. The registry contains many specifications and schemas that are specific to a particular industry. To make the collection as comprehensive as possible, developers can submit content to share with other users. In addition to these features, the Web site offers many more useful items.