分层模型 - 视图 - 控制器（HMVC）的示例？

I'm interested in the Presentation-Abstraction-Control? (aka Hierarchical-Model-View-Controller (HMVC)) Architectural Pattern for constructing complex user interfaces (GUI or web) and was wondering if anyone was aware of any examples in the wild where I could read the code?I'm interested in the Presentation-Abstraction-