protected function setAtExtensions() { if (!is_null($this->atEppExtensionChain)) { /* @var atEppExtensionChain $this->atEppExtensionChain */ $this->atEppExtensionChain->setEppRequestExtension($this, $this->getExtension()); $this->addExtension('xmlns:xsi', atEppConstants::w3SchemaLocation); } }