libxml2
Libxml2 is the XML C parser and toolkit developed for the Gnome project (but usable outside of the Gnomeplatform), it is free software available under the MIT License. XML itself is a metalanguage to design markuplanguages, 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 libraryis written in C a variety of language bindings make it available in other environments.