Namespaces in Drupal 8

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Introduction to namespaces

PHP classes, interfaces, and traits in Drupal are namespaced. See the Objected-oriented programming conventions for more information.

Namespace
Drupal\filter\ProxyClass
Drupal\filter\Render
Drupal\filter_test\Form
Drupal\filter_test\Plugin\Filter
Drupal\filter_test_plugin\Plugin\Filter
Drupal\form_test
Drupal\form_test\Controller
Drupal\form_test\EventSubscriber
Drupal\form_test\Form
Drupal\form_test\Plugin\Block
Drupal\form_test\StackMiddleware
Drupal\forum
Drupal\forum\Breadcrumb
Drupal\forum\Controller
Drupal\forum\Form
Drupal\forum\Plugin\Block
Drupal\forum\Plugin\Validation\Constraint
Drupal\forum\ProxyClass
Drupal\FunctionalJavascriptTests
Drupal\FunctionalJavascriptTests\Ajax
Drupal\FunctionalJavascriptTests\Core
Drupal\FunctionalJavascriptTests\Core\Form
Drupal\FunctionalJavascriptTests\Core\Installer\Form
Drupal\FunctionalJavascriptTests\Core\Session
Drupal\FunctionalJavascriptTests\Dialog
Drupal\FunctionalJavascriptTests\EntityReference
Drupal\FunctionalJavascriptTests\TableDrag
Drupal\FunctionalJavascriptTests\Tests
Drupal\FunctionalJavascriptTests\Theme
Drupal\FunctionalTests
Drupal\FunctionalTests\Bootstrap
Drupal\FunctionalTests\Breadcrumb
Drupal\FunctionalTests\Core\Config
Drupal\FunctionalTests\Core\Test
Drupal\FunctionalTests\Datetime
Drupal\FunctionalTests\Entity
Drupal\FunctionalTests\Hal
Drupal\FunctionalTests\HttpKernel
Drupal\FunctionalTests\Image
Drupal\FunctionalTests\Installer
Drupal\FunctionalTests\Rest
Drupal\FunctionalTests\Routing
Drupal\FunctionalTests\Theme
Drupal\FunctionalTests\Update
Drupal\hal
Drupal\hal\Encoder
Drupal\hal\LinkManager
Drupal\hal\Normalizer
Drupal\help
Drupal\help\Annotation