Why isn't there a universal data format for résumés?

I thought at first it was something to do with my CV's decorative layout, so I tried creating a new one from scratch that's laid out with the intention of being minimally confusing for a parsing algorithm. My name and contact info is at the top, then an "Experience" header, followed by sub-headers with the name of each job, with labeled bullet-items under each one which include things like dates worked, tech used, tasks performed, etc. The algorithm doesn't seem to do any better with this. It picked two work-experience items seemingly at random, and it got the dates completely wrong for the first one. Yes, I can go in and manually enter all my work experience - but I have to do this for every new site where I apply for work, AND - this is the key thing - there's no way to SAVE THAT WORK in a format which I can reload elsewhere. The larger employers and job-hosting web sites need to get their acts together and work this out. Some kind of XML microformat seems like a good idea to me, though JSON would probably work fine too.