18      * @param int $rev
21     public function getFilename($id, $rev)  argument
24         return $conf['olddir'] . '/' . utf8_encodeFN($id) . '.' . $rev . '.renderevision.xhtml';
31      * @param int $rev
35     public function saveRevision($id, $rev, $content)  argument
37         $file = $this->getFilename($id, $rev);
45      * @param int $rev
48     public function getRevision($id, $rev)  argument
50         if(!$this->hasRevision($id, $rev)) return false;
51         $file = $this->getFilename($id, $rev);
59      * @param int $rev
62     public function hasRevision($id, $rev)  argument
64         $file = $this->getFilename($id, $rev);