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