Can An RTML Site be validated - at all?

I have Yahoo stores and have read so much on having one's site validated for Google. Over the years my two sites have gotten bells & whistles via RTML, HTML, CSS...don't even know what all, to add text links (instead of graphic navigation), breadcrumbs, these sort of things that are "add ons". Every HTML Validator goes haywire when I enter my sites into them.

BTW, I have one Y store that kicks butt on Google & other SE's and another that has tanked from 1's & 2's for all search terms on Google to non-existent since Florida update. Both sites are similarly laid out and optimized, linked decently (not to each other).....don't get it and hoped to find errors on the site with problems by validating? Thanks in advance!

I'm not actually familiar with RTML - is it some sort of proprietry coding for Y! stores?

It is the language that Yahoo! uses in it's Y! stores. I'm surprised that no one has heard of it or knows how to validate the code of a Y! store website?? I don't know beans about it and have posted around over the past year w/o any luck. Thanks!
CZ

Yikes! I have never heard of RTML. going to google to search now

If it's a proprietry language I doubt it'll ever validate to w3c standards.