ExtensionInterface

class \Symfony\Component\CssSelector\XPath\Extension\AbstractExtension implements \Symfony\Component\CssSelector\XPath\Extension\ExtensionInterface
class \Symfony\Component\CssSelector\XPath\Extension\AttributeMatchingExtension extends \Symfony\Component\CssSelector\XPath\Extension\AbstractExtension
class \Symfony\Component\CssSelector\XPath\Extension\CombinationExtension extends \Symfony\Component\CssSelector\XPath\Extension\AbstractExtension
class \Symfony\Component\CssSelector\XPath\Extension\FunctionExtension extends \Symfony\Component\CssSelector\XPath\Extension\AbstractExtension
class \Symfony\Component\CssSelector\XPath\Extension\HtmlExtension extends \Symfony\Component\CssSelector\XPath\Extension\AbstractExtension
class \Symfony\Component\CssSelector\XPath\Extension\NodeExtension extends \Symfony\Component\CssSelector\XPath\Extension\AbstractExtension
class \Symfony\Component\CssSelector\XPath\Extension\PseudoClassExtension extends \Symfony\Component\CssSelector\XPath\Extension\AbstractExtension