The straightforward way to separate content from presentation is to have a step that transforms that content into a specific form: 2D screen based, 2D page-base

The straightforward way to separate content from presentation is to have a step that transforms that content into a specific form: 2D screen based, 2D page-based, aural, etc., including different purpose like a small read-only mobile gadget vs a full-screen desktop app. Web technologies actually have a beginning of this: XML source + XSLT processor, which is a general-purpose declarative tree transducer. But web community took a wrong turn here.