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\big_pipe_test
Drupal\big_pipe_test\EventSubscriber
Drupal\big_pipe_test\Form
Drupal\block
Drupal\block\Controller
Drupal\block\Entity
Drupal\block\EventSubscriber
Drupal\block\Form
Drupal\block\Plugin\Derivative
Drupal\block\Plugin\DisplayVariant
Drupal\block\Plugin\migrate\destination
Drupal\block\Plugin\migrate\process
Drupal\block\Plugin\migrate\source
Drupal\block\Plugin\migrate\source\d6
Drupal\block\Plugin\migrate\source\d7
Drupal\block\Tests
Drupal\block\Theme
Drupal\block_content
Drupal\block_content\Access
Drupal\block_content\Controller
Drupal\block_content\Entity
Drupal\block_content\Event
Drupal\block_content\Form
Drupal\block_content\Plugin\Block
Drupal\block_content\Plugin\Derivative
Drupal\block_content\Plugin\Menu\LocalAction
Drupal\block_content\Plugin\migrate\source\d6
Drupal\block_content\Plugin\migrate\source\d7
Drupal\block_content\Plugin\views\area
Drupal\block_content\Plugin\views\wizard
Drupal\block_content\Tests
Drupal\block_content\Tests\Views
Drupal\block_content_test\Plugin\EntityReferenceSelection
Drupal\block_place\EventSubscriber
Drupal\block_place\Plugin\DisplayVariant
Drupal\block_test
Drupal\block_test\ContextProvider
Drupal\block_test\Controller
Drupal\block_test\Form
Drupal\block_test\PluginForm
Drupal\block_test\Plugin\Block
Drupal\block_test\Plugin\Condition
Drupal\book
Drupal\book\Access
Drupal\book\Cache
Drupal\book\Controller
Drupal\book\Form
Drupal\book\Plugin\Block
Drupal\book\Plugin\migrate\destination
Drupal\book\Plugin\migrate\source