>From: John Max Skaller <skaller@ozemail.com.au>

>For example: delete: if  a binding is deleted it won't be presented 
>subsequently.
>Add: the binding may or may not be presented.
>Replace:  if the binding is presented, it will have the data value used 
>in replace.
>If the binding was already presented, it will not be represented.
>Otherwise: the binding will be presented with its initial data value.

AFAICT from a quick look at the source, it's more like this:

delete: the binding may or may not be presented subsequently
add: the binding may or may not be presented
replace: the binding may be presented with the old or the new data
value; if it was already presented, it will not be represented
otherwise: the binding will be presented with its initial data value.

-- Damien
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