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So, hypothetically speaking, let's say you want to design a system where you had absolute control over which applications your customers were allowed to install on your device. Certainly you would want to ensure that you were the only source for applications. But for extraordinary cases, you might also need to create a blacklist of applications.

Each entry in the blacklist would also need a human-readable title -- presumably the name of the app -- and perhaps even a human-readable description to explain why the app was blacklisted. But each entry would also need a unique identifier, of course, so you don't accidentally get confused between six apps named "TODO." Finally, you would probably want to include the date that the entry was added to the list.

Furthermore, since you anticipate continually adding new applications to this blacklist to protect your and your partners' business model, you would need your proprietary non-browser-based client to periodically poll the list for changes.

All of which raises a very serious question: what data format should you use for the list?

If you answered "JSON" then congratulations, you win the Trendy Tech of the Month Award lose! To collect your prize, please proceed through the door marked "This way to the egress." Some restrictions apply.

Update: OK, OK, it's a "Core Location" blacklist. Big deal. I'll see your tree and raise you a forest:

... an independent engineer discovered code inside the iPhone that suggested iPhones routinely check an Apple Web site that could, in theory trigger the removal of the undesirable software from the devices.

Mr. Jobs confirmed such a capability exists, but argued that Apple needs it in case it inadvertently allows a malicious program -- one that stole users' personal data, for example -- to be distributed to iPhones through the App Store.

As I've said before, "protecting users from malicious programs" is code for "cryptographically enforcing restrictions on applications to protect our and our partners’ business model." The bullshit about "stealing personal data" is just a rhetorical sleight of hand, like the RIAA claiming that piracy hurts "artists and other rights holders" when 99% of artists don't own the rights to their own songs. How many apps has Apple de-listed over privacy concerns? Only one that I know of, and it was quickly reinstated after a quick update. How many apps has Apple de-listed (or prevented being written in the first place) to protect their business? Lots and lots.