Retrieving Conformance Lists
UTTypeCopyDeclaration() offers the most general (and most useful) of all UTI functions in the iOS API. It returns a dictionary that includes the following keys:
kUTTypeIdentifierKey—The UTI name, which you passed to the function (for example, public.mpeg)
kUTTypeConformsToKey—Any parents that the type conforms to (for example, public.mpeg conforms to public.movie)
kUTTypeDescriptionKey—A real-world description of the ...
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