Bits and Pieces about Lenya and OpenOffice.org
Both OpenOffice.org and lenya are XML based.
Perhaps set up the OpenOffice.org XML document as a Apache Lenya document type.
OpenOffice.org's DTD: http://xml.openoffice.org/source/browse/xml/xmloff/dtd/.
OpenOffice.org's File specification: http://xml.openoffice.org/xml_specification.pdf
OpenOffice.org's XML FAQ: http://xml.openoffice.org/faq.html
There is an XSL already available to display OpenOffice.org as XHTML: http://xml.openoffice.org/sx2ml/ (XSL-stylesheets OO --> HTML)
Have a look at import.xmap which has starting points.
Have a look at this old page: WyonaOpenOffice
OpenOffice integration in Apache Forrest
Apache Forrest already has support for OpenOffice.org documents.