[DDI-SRG] Coded missing values

[Pascal Heus]

All:
I have a couple of questions on coded missing values (like -1=missing, 
not system missing) :
- In DDI 2.0, missing values are flagged in the catgry element of the 
variable. However, in SPSS, I can define missing value codes without 
defining categories. In such case, is there a way to capture this in DDI 
2.0?
- How do we capture missing value codes in DDI 3.0? According to Wendy's 
mapping, it goes into the l:category element. As in the SPSS example 
above, I could however define a discrete code value that is not 
associated with a l:category but represent a missing value. Should I 
file this issue in Mantis?
thanks
*P

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