Draft XForms 1.2 modularized RNC Schema

Here's a draft version of an example of a XForms 1.2 modularized schema.
Unlike the XForms 1.1 example I sent out, this one doesn't necessarily
work.
It's an example to show how things might work.

The xforms11.rnc file is also included in here, for reference.  The
XForms 12 schema is supposed to achieve the same result, but following
the modularity outline from
http://www.w3.org/MarkUp/Forms/wiki/XForms_Future_Features

The biggest problem I encountered is the updates to single-node and
nodeset bindings.
They start out with a single required attribute, and morph into a more
complex set of co-occurence constraints, and I don't know how to do that
via incremental updates from includes.

I believe this is in a state that Nick van den Bleeken can move forward
with it.

I've got a message in to Micah Dubinko about this as well, to see if we
can obtain the original work under the W3C Software License, or if we
must start afresh by re-casting the XML Schema description in RNC.

Leigh.