Oxygen XML comes with schemas and DTDs for popular or major XML and XSL formats including DocBook (versions 4.0 and 5.0), TEI format, XSLT (versions 1.0, 2.0 and 3.0), DITA, XHTML and HTML 5. Extending to new XML dialects or specialisations is achieved by adding the relevant framework or implementation to the software or loading the document type or schema, thus enabling an adaptable environment which is itself configured entirely by XML, which draws parallels with Emacs and its ability to edit itself while implementing the Lisp dialect it runs in.