I Looked at the site for z.m.l (http://www.z-m-l.com/). It doesn't seem to do math, so it's a nonstarter.
BTW, Pandoc (which does do LaTeX math) really needs no improvement, only more widespread implementation (e.g., an online site, and/or a chrome extension coded in javascript.) I suppose its being written in Haskell has been an impediment.
it's "lighter" than all the other light-markup languages.
it's more _powerful_ than the others, including asciidoc.
it's also far more agile, and much easier to understand.
and i won't allow it to be fragmented, like markdown is.
i've coded converters in javascript and other languages.
the javascript minimizes well for inclusion in web-pages.
i have cross-plat apps, and a web-app converter with a.p.i.
output formats include .html, .epub, .mobi, .pdf, and more.
if there's anything i haven't thought of, do please tell me.
you can reach me at my e-mail address given in my profile.
-bowerbird