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Cannot find kIOUSBInterfaceID...

I was reading over the documentation for doing bulk I/O from a USB device and found a problem in the sample code on the page. Here's the code

        //Now create the device interface for the interface

        result = (*plugInInterface)->QueryInterface(plugInInterface,

                    CFUUIDGetUUIDBytes(kIOUSBInterfaceID),

                    (LPVOID) &interface);


The code uses a constant kIOUSBInterfaceID which doesn't seem to exist outside of this code snippet. I searched the Apple website, the Internet as well as my hard drive and could find no other references to this constant. If this is not the correct constant, what is for creating a new USB interface?

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