XPL the eXtensible presentation language

The last decade has witnessed a growing interest in the development of web interfaces enabling both multiple ways \udto access contents and, at the same time, fruition by multiple modalities of interaction (point-and-click, contents reading, voice \udcommands, gestures, etc.). In this paper we describe a framework aimed at streamlining the design process of multi-channel, \udmultimodal interfaces enabling full reuse of software components. This framework is called the eXtensible Presentation archi- \udtecture and Language (XPL), a presentation language based on design pattern paradigm that keeps separated the presentation \udlayer from the underlying programming logic. The language supplies a methodology to expedite multimodal interface devel- \udopment and to reduce the effort to implement interfaces for multiple access devices, by means of using the same code. This \udpaper describes a methodology approach based on Visual Design Pattern (ViDP) and Verbal Design Pattern (VeDP), offering \udexamples of multimodal and multichannel interfaces created with the XPL Editor