For 5 years now, doctoral candidates of Humboldt- University at Berlin can choose the digital publication as one option to publish their dissertation. The ?Electronic Publishing? Group provides stylesheets for Microsoft Word, WordPerfect and Staroffice/Openoffice in order to allow the authors to structure their digital documents semantically. It is neccessary to prepare documents that way, because they are converted into an XMl format afterwards. The XML document than is an instance of the xDiML.DTD (DissertationMarkupLanguage). This DTD has been developed within several electronic publishing projects at Humboldt-University. Since 1997 an SGML/XML- based concept for the long term preservation of digital publications has been used, in orde...