public function createReference(Asset $a, Folder $parent, $name)
 {
     if (trim($name) == "") {
         throw new e\CreationErrorException(S_SPAN . c\M::EMPTY_REFERENCE_NAME . E_SPAN);
     }
     $asset = AssetTemplate::getReference();
     $asset->reference->name = $name;
     $asset->reference->parentFolderPath = $parent->getPath();
     $asset->reference->siteName = $parent->getSiteName();
     $asset->reference->referencedAssetType = $a->getType();
     $asset->reference->referencedAssetId = $a->getId();
     return $this->createAsset($asset, Reference::TYPE, $this->getPath($parent, $name), $parent->getSiteName());
 }