/**
  * Actually render the page content.
  * @param string $sParameter URL parameters to special page.
  * @return string Rendered HTML output.
  */
 public function execute($sParameter)
 {
     parent::execute($sParameter);
     $this->getOutput()->addModuleStyles('ext.bluespice.extendedsearch.specialpage.style');
     $this->getOutput()->addModules('ext.bluespice.extendedsearch.specialpage');
     $oExtendedsearchBase = new ExtendedSearchBase($this);
     $oView = $oExtendedsearchBase->renderSpecialpage();
     $this->getOutput()->addHTML($oView->execute());
 }