[DDI-SRG] Mixing code and value ranges

[Pascal Heus]

Wendy and all:
In DDI, how do we document a variable that mixes value ranges and 
code(s)? With ValueRepresentation no longer non-repeatable, this now 
seem tricky....
For example, I can have a numeric variable like "Number of cars owned" 
with 99="don't know". I can I say this must be in the 0-99 range and 
link the value 99 to a code?
I'm wondering if ValueRepresentation and CodeRepresentation should be 
separated or have the ability to have a CodeRepresentation and 
Date/Numeric/TextRepresentation at the same time.
thanks
*P