public function createXhtmlPage(Folder $parent, $name, $xhtml = "", ContentType $ct)
 {
     if (trim($name) == "") {
         throw new e\CreationErrorException(S_SPAN . c\M::EMPTY_PAGE_NAME . E_SPAN);
     }
     $asset = AssetTemplate::getXhtmlPage();
     $asset->page->name = $name;
     $asset->page->parentFolderPath = $parent->getPath();
     $asset->page->siteName = $parent->getSiteName();
     $asset->page->contentTypePath = $ct->getPath();
     if (trim($xhtml) != "") {
         $asset->page->xhtml = $xhtml;
     }
     return $this->createAsset($asset, Page::TYPE, $this->getPath($parent, $name), $parent->getSiteName());
 }