Libxml2 is the XML C parser and toolkit developed for the Gnome project (but usable outside of the Gnome platform). It is free software available under the MIT License. XML itself is a metalanguage to design markup languages, i.e. text language where semantic and structure are added to the content using extra 'markup' information enclosed between angle brackets. HTML is the most well-known markup language. Though the library is written in C, a variety of language bindings make it available in other environments.