How is this classification of PHP products?

At a place, I saw classification like this




CakePHP ,
Code Igniter ,
eZ Components ,
Smarty ,
Symphony ,
Zend Framework.

Drupal ,
Joomla ,
Mambo ,
osCommerce ,

Now just I will take one - Drupal. Don't we say Drupal a framework? Even drupal site write itself as framework. I am not getting the classification of these product. On what line this is classified. Can you solve the puzzle!

  • # 1 - by PixelCrayons

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  • # 2 - by benivolent

    Drupal plays main role in CMS Website Development

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