--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\CssSelector\XPath\Extension;
+
+/**
+ * XPath expression translator abstract extension.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
+ */
+abstract class AbstractExtension implements ExtensionInterface
+{
+ /**
+ * {@inheritdoc}
+ */
+ public function getNodeTranslators()
+ {
+ return array();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getCombinationTranslators()
+ {
+ return array();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFunctionTranslators()
+ {
+ return array();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getPseudoClassTranslators()
+ {
+ return array();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getAttributeMatchingTranslators()
+ {
+ return array();
+ }
+}