W3C:

2008-04-14: The Mobile Web Best Practices Working Group has published the First Public Working Draft of Content Transformation Guidelines 1.0. This document provides guidance to managers of content transformation proxies and to content providers for how to coordinate when delivering Web content. Content transformation techniques diverge widely on the web, with many non-standard HTTP implications, and no well-understood means either of identifying the presence of such transforming proxies, nor of controlling their actions. This document establishes a framework to allow that to happen. Learn more about the Mobile Web Initiative Activity. (Permalink)