The Drupal ecommerce module suite is a rapidly evolving and quite massive part of Drupal, and newcoming developers may be overwhelmed by the sheer number of modules included in the suite. This UML dependency diagram chart should help understand how the modules fit together.

For anyone trying to understand the inner working of the Drupal e-Commerce 4.6.* module, a pair of UML data model diagrams should be really helpful.

Mambo CMS (Mamboserver, Joomla) is an important Open Source CMS these days, and it is built on a complex data model. So I tried to abstract the main entities and model them in the form of an abused UML class diagram. Have a look.