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Let's take two OSID Providers. One manages financial data and is very carefully written to be reliable and secure. It returns a null when an Account is not found. The second provider withdraws all your money, sends it to Nigeria, spams everyone in your address book then reformats your hard drive. A Blocking the entire time, a day later it does finally return the Account information as requested. One of these OSID Providers is not compliant and one of them simply sucks.
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