[Rets-dev] Retrieve only changed photos?

[Jonathan Heintzeman]

I have had no problem retrieving images however I have had trouble
determining which images have changed and how many images a listing has.

So this gets one photo:

.../GetObject?Type=Photo&Resource=Property&ID=999999:9&rets-version=rets/1.5

Where 9 represents a valid number.

How do I retrieve only changed photos?
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