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==Architecture== Drupal is based on the [[Presentation Abstraction Control]] architecture, or PAC. The menu system acts as the Controller. It accepts input via a single source ([[Hypertext Transfer Protocol#HTTP GET|HTTP GET]] and [[POST (HTTP)|POST]]), routes requests to the appropriate helper functions, pulls data out of the Abstraction (nodes and, from Drupal 5 onwards, forms), and then pushes it through a filter to get a Presentation of it (the theme system). It even has multiple, parallel PAC agents in the form of blocks that push data out to a common canvas (page.tpl.php).<ref>{{Cite web | url=http://www.garfieldtech.com/blog/mvc-vs-pac | title=MVC vs. PAC}}</ref>
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