/usr/share/php/Symfony/Component/CssSelector/XPath/ is in php-symfony-css-selector 2.3.21+dfsg-4+deb8u3.
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/usr/share/php/Symfony/Component/CssSelector/XPath/Extension/
/usr/share/php/Symfony/Component/CssSelector/XPath/Extension/AbstractExtension.php
/usr/share/php/Symfony/Component/CssSelector/XPath/Extension/AttributeMatchingExtension.php
/usr/share/php/Symfony/Component/CssSelector/XPath/Extension/CombinationExtension.php
/usr/share/php/Symfony/Component/CssSelector/XPath/Extension/ExtensionInterface.php
/usr/share/php/Symfony/Component/CssSelector/XPath/Extension/FunctionExtension.php
/usr/share/php/Symfony/Component/CssSelector/XPath/Extension/HtmlExtension.php
/usr/share/php/Symfony/Component/CssSelector/XPath/Extension/NodeExtension.php
/usr/share/php/Symfony/Component/CssSelector/XPath/Extension/PseudoClassExtension.php
/usr/share/php/Symfony/Component/CssSelector/XPath/Translator.php
/usr/share/php/Symfony/Component/CssSelector/XPath/TranslatorInterface.php
/usr/share/php/Symfony/Component/CssSelector/XPath/XPathExpr.php