Currently, the LwDITA DTDs only uses entities for <ph> and <data>. This means that anyone who wants to specialize XDITA, can only create specializations of <ph> and <data>. The same would be true for constraints and expansion. Was this an intentional choice? Best, Kris Kristen James Eberlein Chair, OASIS DITA Technical Committee Owner, Eberlein Consulting LLC
kris@eberleinconsulting.com Skype: kriseberlein; voice: +1 (919) 622-1501