public function render()
{
foreach ($this->oPresentation->getAllMasterSlides() as $oMasterSlide) {
// Add the relations from the masterSlide to the ZIP file
$this->oZip->addFromString('ppt/slideMasters/_rels/slideMaster' . $oMasterSlide->getRelsIndex() . '.xml.rels', $this->writeSlideMasterRelationships($oMasterSlide));
// Add the information from the masterSlide to the ZIP file
$this->oZip->addFromString('ppt/slideMasters/slideMaster' . $oMasterSlide->getRelsIndex() . '.xml', $this->writeSlideMaster($oMasterSlide));
}
return $this->oZip;
}