<p>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:</p>
<p><a href="https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md" rel="nofollow">https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md</a></p>
<p>The vendor namespace for Drupal-originated code is "Drupal".</p>
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