I haven't read the detail of the specification, but is a great idea. The amount of similarity between pages of Markup (esp XML) or related pieces of JavaScript

I haven't read the detail of the specification, but is a great idea. The amount of similarity between pages of Markup (esp XML) or related pieces of JavaScript could be significant. I found this Google PowerPoint that hints at some of the benefits http://209.85.141.104/search?q=cache:RIkP-5qZ4awJ:assets.en.oreilly.com/1/event/7/Shared%2520Dictionary%2520Compression%2520Over%2520HTTP%2520Presentation.ppt+SDCH+results&hl=en http://209.85.141.104/search?q=cache:RIkP-5qZ4awJ:assets.en.... The PPT claims About 40 percent data reduction better than Gzip alone on Google search.