Thanks hdb,

I provided a little more detail in response to "choroba" below. AND was included for exactly the use case you mentioned, testing multiple keys (in the response below I give an example of a single key being used as a composite so it can be tested against multiple conditionals). I understand the deconstruction of the composite key in itself will require a bit of logic but I have already written a fair amount of code that deals building and breaking apart the composite keys.