Both OpenOffice.org and lenya are XML based.
Perhaps set up the OpenOffice.org XML document as a Apache Lenya document type.
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
Apache Forrest already has support for OpenOffice.org documents.
http://typo3.org/documentation/document-library/rlmp_officeimport/ http://typo3.org/documentation/document-library/doc_typo3org/Using_Open_Office_Wr/