On a recent post Sron stated

Don't use 'available' use 'changing' or 'changing from' depending on
exactly what it is you are trying to determine. 'available' will only be
true if there are values being added.

Can someone clarify this for me.

I have assumed that
attribute available
and
source attribute available

mean that the attribute is available in the source data store.
(similarly for the destination attribute)

Also,
operation attribute available
means that the current document contains a value for that attribute.
This could mean that the attribute has been added or changed. Whereas
operation attribute changing
means that an existing attribute value is changing.

This is at slight variance to what Sron defined.

Your help much appreciated.


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chall
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