He is noted for his controversial support for OpenDocument, a standard format for office documents (ISO/IEC 26300).
An example is the web service which enables the remote generation of Europass documents in PDF, OpenDocument, or Microsoft Word formats, starting from a Europass XML file.
In October 2007, the OpenDocument Foundation controversially switched its support from OpenDocument to the World Wide Web Consortium (W3C)'s Compound Document Format (CDF).
One of the external commentors on OpenDocument, David A. Wheeler, released a first draft of a specification for formulae in February 2005.