[DAS2] question on properties

[Suzanna Lewis]

You probably know the answer to this Andrew.

One of the cases we encountered was unique properties vs cumulative 
properties.

For a simplistic (i.e. don't quibble to closely, I'm just trying to 
explain) example pretend that "ssn" and "comment" are both properties.

On the client side the appropriate behavior for these is different if 
the data coming over from the server contains >1 prop element with that 
tag.

If the client sees "ssn" twice it winces and then either ignores or 
overwrites with the 2nd value.

If the client sees "comment" twice then it appends the additional 
comment.

Question: Is this kind of information included in the spec? Uniqueness 
vs. cumulative