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CssSelector Component ===================== CssSelector converts CSS selectors to XPath expressions. The component only goal is to convert CSS selectors to their XPath equivalents: use Symfony\Component\CssSelector\CssSelector; print CssSelector::toXPath('div.item > h4 > a'); HTML and XML are different -------------------------- The `CssSelector` component comes with an `HTML` extension which is enabled by default. If you need to use this component with `XML` documents, you have to disable this `HTML` extension. That's because, `HTML` tag & attribute names are always lower-cased, but case-sensitive in `XML`: // disable `HTML` extension: CssSelector::disableHtmlExtension(); // re-enable `HTML` extension: CssSelector::enableHtmlExtension(); When the `HTML` extension is enabled, tag names are lower-cased, attribute names are lower-cased, the following extra pseudo-classes are supported: `checked`, `link`, `disabled`, `enabled`, `selected`, `invalid`, `hover`, `visited`, and the `lang()` function is also added. Resources --------- This component is a port of the Python lxml library, which is copyright Infrae and distributed under the BSD license. Current code is a port of https://github.com/SimonSapin/cssselect@v0.7.1 You can run the unit tests with the following command: $ cd path/to/Symfony/Component/CssSelector/ $ composer.phar install $ phpunit