XLML (eXtended Logical Markup Language) is an XML document type especially designed (but not restricted) for authoring e-learning documents. The generator XlmlGen transforms XLML-documents into HTML pages.

XLML is designed as a XHTML integration set application. It extends XHTML with a set of elements to define chapters, table of contents, index, glossary, bibiography and common tables and lists. The DTD is designed in a way that document authors can concentrate on the content of a document rather then dealing with HTML specific layout details. The page layout is widely controllable by CSS.