I've posted an introduction presentation file about one of the thoughts behind the XAPP-LE community on slideshare. The topic is "The Open Source Strategy for the Versatile IoT and Smart Applications Era". (The current version of the slides was prepared in Chinese, though. )
This talk was given in a forum of the 41st Taipei International Electronics Show on Oct. 7th, 2015. It describes how SoC or Product vendors solve the diversified needs within the IoT and Smart Applications Era, by way of the supporting the open source community. XAPP-LE was illustrated as a good example.