[xwiki-users] Virtual wiki doesn't work

I'm trying to setup a virtual sub-wiki following instructions from: http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Virtualization Since I'm using PostgreSQL I followed the "By hand" method. One of the sub-wiki is called sub1, so I created a new database sub1 giving PostgreSQL user xwiki all privileges upon it. I then created a new page XWiki.XWikiServerSub1, attached a XWikiServerClass object to it specifying server=sub1.mydomain.com Now the server part seems to be working, because if I point my browser to sub1.mydomain.com:8080/... I see XWiki pages, while if I point it to anythingelse.mydomain.com:8080/... I see the page pointed to by xwiki.virtual.redirect. Problem is the database for the sub-wiki is never used!!! The main wiki "xwiki" database is used regardless of the name of the XWiki.XWikiServerSub1 page!!! What could be wrong??? The XWiki.XWikiServerSub1 has to be orphan or _must_ it have some specific parent??? Thank you all in advance for your help!!! Bye Paolo