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Bit-Flag Data Constants
For extensible bit-flag data constants, a service-provider vendor can define
new values for specified bits. Because most bit-flag constants are DWORDs, a
specific number of the lower bits are usually reserved for common extensions,
while the remaining upper bits are available for vendor-specific extensions. Common
bit flags are assigned from bit zero up, and vendor-specific extensions should
be assigned from bit 31 down. This scheme provides maximum flexibility in
assigning bit positions to common extensions, as opposed to vendor-specific
extensions. A vendor is expected to define new values that are natural extensions of
the bit flags defined by the API.
Extensible data structures have a variably sized field that is reserved for
device-specific use. Because the field is variably sized, the service provider
decides the field's amount of information and interpretation. A vendor that
defines a device-specific field is expected to make these natural extensions of the
original data structure defined by the API.
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