Additional normative rule (tool issue)

["Scott Came" <scott@justiceintegration.com>]

Another minor tool issue...discussion welcome.

This would likely go either in the mapping section (5) or
schema section (6).  It is based on the fact that the SSGT wantlist format is a de facto standard.  It would be nice
if we could get XSTF to donate the wantlist schema to us, though GTRI may own the IP, so perhaps they can't.  In any
case, it's the closest thing we have to a standard way of specifying how to transform the full GJXDM reference schema
into a proper subset.  This rule also increases interoperability, by providing a (albeit de facto standard) way of
producing the subset, independent of whatever tool was used to do the mapping.  Thus:

If the schema set
includes a subset schema, then the schema set must also include a GJXDM subset wantlist that:

a.  Is valid
against the wantlist schema (http://justicexml.gtri.gatech.edu/wantlist_1.xsd)
b. 
When input into the SSGT, produces the subset schema