The easiest way to start with rdfhomepage is to download my_rdfhomepage_sven.zip, a ZIP-file containing a snapshot of Sven's rdfhomepage configuration & data. You can look into, edit the files (especially config.php and config/homepage.rdf), and then test and play around a bit.

You may want to check out the rdfhomepage package (in particular, if you are not a DFKI worker):

cd ~homer/public_html/whereever/
svn co https://rdfhomepage.opendfki.de/repos/rdfhomepage/trunk/rdfhomepage
svn co https://rdfhomepage.opendfki.de/repos/rdfhomepage/trunk/myrdfhomepage