[DDI-SRG] Following note added to Bug 153

[Wendy Thomas]

I have reviewed the contents of the schemas and all instances where 
CodeValueType is used are optional with the following exception:

Its use in describing the code of a geographic level or geography value in 
which case the use of the parent level is optional. In short, you use it 
if it has a code you want to describe and if you decide to describe the 
code, you're forced to put in the code. In this case there is no logical 
case where it would be empty.

In other words you would be solving a problem that really doesn't exist. 
If I'm not using it, it just don't put it in, or put in its parent in the 
geography case noted above.

Wendy

Wendy L. Thomas                          Phone: +1 612.624.4389
Data Access Core Director		 Fax:   +1 612.626.8375
Minnesota Population Center              Email: wlt at pop.umn.edu
University of Minnesota
50 Willey Hall
225 19th Avenue South
Minneapolis, MN 55455