As others have noted, RTFD is a packaged file format, consisting of a
directory in the file system containing the underlying RTF and any
attachments. There are therefore two representations of RTFD: first,
the on-disk format, and second, a serialized format used on the
pasteboard. There are therefore two methods for obtaining RTF from an
attributed string, -RTFDFromRange:documentAttributes: (for the
pasteboard representation, expressed as an NSData), and -
RTFDFileWrapperFromRange:documentAttributes: (for the on-disk
representation, expressed as an NSFileWrapper). These two methods are
conveniences, specialized to the case of RTFD, for the more general
methods -dataFromRange:documentAttributes:error: and -
fileWrapperFromRange:documentAttributes:error:.
Douglas Davidson
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