Questions on Delivery Context Ontology

Greetings,
We are in the process of adapting xml documents based on the characteristics of web-connected mailing systems. As part of this process, we want to conform to the principles that your group is doing in the delivery context ontology effort. Though OWL is not currently in our technology stack (nor RDFS), we are trying to model the concepts in XML Schema in a way to move to the OWL version when the ideas modeled in the ontology stabilize and the OWL tools and engines mature and are accepted in our organization. To this end, I've tried to develop a schema that captures the concepts and details provided in the Ontology, as defined by the April 15, 2008 working draft.
There are a few high-level questions I have. First, I see that the starting point appears to the CCPP version 2.0 (the RFDS version). From what I can tell, the CCPP effort really focused on location-based computing, as enabled primarily by cell phones. The CCPP seems to have artifacts specific to this focus, e.g., explicitly calling out camera elements as opposed to representing it as an example input device. Also, the notion of applications that can run on the device appear very centric to document delivery (e.g., browser-based). Further, from what I can determine, the scope of the Delivery Context Ontology is really targeted at a wider class of web-based devices and applications, and so such artifacts, though currently present, will likely be generalized for true ubiquitous computing systems. Assuming that my understandings of both existing work and current direction are on base, I believe that I have a representation of the concepts significantly implemented in an XML Schema. Note that there were some aspects of the ontology that I hedged, since I did not understand certain parts of it. These will hopefully be represented better as my team's project (and our understanding) progresses.
So, I'd like to offer up the XML schema as a way of representing some of the more specific questions I have, and as a potential way to perhaps help convey issues specific to web-connected mailing systems. For convenience, I've attached an initial draft of the schema documents that we've created. Does it make sense for my group to get involved in this effort, and if so, how?
Thanks much,
Deborra Zukowski, Pitney Bowes
PS. I've put in some document elements in the schema to highlight places where I made changes from the structure of the ontology. I