An API for Siri makes me ponder the huge question: How will Apple assign sentences and queries in, shall we call it "Siri Space" to individual applications.

Siri – Check me in.

Does that go to Foursquare? American Airlines? The Ramada? Some Foursquare knockoff?

I can image a few solutions:

• Use a prefix or delegation clause to carve out a a realm of authority, but that is awkward. (the DNS works), but Siri have foursquare… sounds like you are talking to a finite state machine.

• Let developers say how confident they are that a sentence was for them based on current conditions and the winner gets it, but then the lying cheats would win.

• It could be thrown back in the user's face to disambiguate and then remember for future occurrences and good luck if you change your mind about priority at a later date.

• The invisible hand could be put to work and let developers rent concepts in Siri Space. That would likely provide a hitherto unseen form of grief and failure.

Remember it took a year to get native Apps after the iPhone came out. It will take no less time for the Siri masters to work out how or if developers can be mapped into Siri-space.