Problem with multi-field keys

Hello all,

I'm old to programming but new to XML and XML Schema.  I'm trying to
define a unique or primary key on a parent-child combination (i.e.
individual elements may not be unique, but the combination of element
and category must be).  Although I think I'm forming the key correctly
(you use "." to establish the node context, start from the parent and
work downward to establish uniqueness), the sample document is telling
me I have too many values - in both XMLSpy and MSXML, so I know I'm
doing something wrong.

Can another pair of eyes shed some light?  The attached sample files
illustrate the problem.

Thanks in advance

Jim Stanley
Media Services, Inc.