We have to be able to tell the TEI that it can use the DocBook gui.inlines class along with its normal phrase-level elements, and tell DocBook that it can use the TEI class data in its phrase-level class.

include "tei.rnc" {
	tei.hqphrase |= gui.inlines
	}	
include "docbook.rnc" {
	docbook.text |= tei.data
	start = TEI
}

We know how to do this in RelaxNG, but not yet in ODD... &winita;