My 2 cents is that "descriptive" doesn't need to be part of the resulting name, at least not part of the acronym or codon that is used for the resulting standard. Most folks want biology to be part of the name.
How about "XBio" ? Nothing like it shows up in any of the xml coverage I can find (it is used for a variety of smallscale software projects). It doesn't have to actually stand for any literal phrase (I like the http://xml.coverpages.org/xci.htmlNew Mexico District Court XML Interface (XCI) ) which has a similar derived structure, but at any rate could be "XML for Biology". Xbio is easy to pronounce, somewhat distinctive, contemporary sounding and short.
Julian
P.S. Xtax is also pretty interesting as a acronym, nice pairing of x's and also easy to say and remember.
Julian Humphries DigiMorph.Org Geological Sciences University of Texas at Austin Austin, TX 78712 512-471-3275