HI Markus! We talked about your SVG/XHTML proposal in our ArchCom-RFC meeting today (Phab:E325). Lots of ideas, but no firm conclusions yet. However, I'm planning to move the bulk of the text of T138783 over to Requests for comment/SVG Upload should (optionally) allow the xhtml namespace, since we've found that the wiki is an easier place to collaborate on complicated prose. We're still keeping trck of T138783, and comments are still welcome there too. (And in case you're saying to yourself "oh, I did it wrong", the answer is "no, you didn't". We only move conversations to wiki when they look like they get complicated to negotiate, and this one is)