You don't seem to be aware of any of the work I'm doing on CSTML (built to replace HTML and XML, and yes, built to be useful for legal documents (even though IANAL)). If you're interested in collaborating to go after the law market, let's talk! You're trying to sneak in a side door. I'm planning to smash down the main gates, the ones you say are impregnable. My investigation says they're not unbreakable, but instead strong and brittle. Many attacks will bounce off, yes, but brittleness means that these are defenses that will shatter before they bend.