Are you suggesting a content model like element xenoData { att.global.attributes <http://teijenkins.hcmc.uvic.ca/job/TEIP5-Documentation/ws/P5/Guidelines-web/en/html/ref-att.global.html>, att.global.rendition.attributes <http://teijenkins.hcmc.uvic.ca/job/TEIP5-Documentation/ws/P5/Guidelines-web/en/html/ref-att.global.rendition.html>, att.global.linking.attributes <http://teijenkins.hcmc.uvic.ca/job/TEIP5-Documentation/ws/P5/Guidelines-web/en/html/ref-att.global.linking.html>, att.global.analytic.attributes <http://teijenkins.hcmc.uvic.ca/job/TEIP5-Documentation/ws/P5/Guidelines-web/en/html/ref-att.global.analytic.html>, att.global.facs.attributes <http://teijenkins.hcmc.uvic.ca/job/TEIP5-Documentation/ws/P5/Guidelines-web/en/html/ref-att.global.facs.html>, att.global.change.attributes <http://teijenkins.hcmc.uvic.ca/job/TEIP5-Documentation/ws/P5/Guidelines-web/en/html/ref-att.global.change.html>, att.global.responsibility.attributes <http://teijenkins.hcmc.uvic.ca/job/TEIP5-Documentation/ws/P5/Guidelines-web/en/html/ref-att.global.responsibility.html>, att.declarable.attributes <http://teijenkins.hcmc.uvic.ca/job/TEIP5-Documentation/ws/P5/Guidelines-web/en/html/ref-att.declarable.html>, att.typed.attributes <http://teijenkins.hcmc.uvic.ca/job/TEIP5-Documentation/ws/P5/Guidelines-web/en/html/ref-att.typed.html>, desc?, text | macro.anyXML <http://teijenkins.hcmc.uvic.ca/job/TEIP5-Documentation/ws/P5/Guidelines-web/en/html/ref-macro.anyXML.html>* } Lou? I'd be ok with that, actually. I'll point out too that it has @type and @subtype already, so there are ways to characterize it.