README.txt

The core/lib directory is for classes provided by Drupal Core that are original
to Drupal.  All Drupal-originated code must follow the PSR-0 naming convention
for classes and namespaces as documented here:

https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md

The vendor namespace for Drupal-originated code is "Drupal".

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drupal/core/lib/README.txt
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  1. The core/lib directory is for classes provided by Drupal Core that are original
  2. to Drupal. All Drupal-originated code must follow the PSR-0 naming convention
  3. for classes and namespaces as documented here:
  4. https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md
  5. The vendor namespace for Drupal-originated code is "Drupal".