I have an attributed string that I need to store via NSUserDefaults.
NSTextView uses RTFD data stream when passing this type of data
around via the pasteboard. But typically the pastboard doesn't have
to worry that someone is going to come alond and try to read the
data with a different OS version :-)
Is the RTFD data format backwards (and forwards?) compatible? Or
should I pick another format for storage in NSUserDefaults (or in a
generic plist), such as an archived attributed string?
There are really two RTFD formats; one is the directory-based
structure used for on-disk storage, and the other is the serialized
data used on the pasteboard. The directory-based version is one of
our common file formats, so it pretty much has to be compatible across
versions; older OS versions should simply ignore newer tags that they
don't recognize. The serialized data format is a fairly simple
mapping of the directory-based one, so I think the same should apply
to it. There are other choices, of course--for example, one could
choose to use HTML, or a WebArchive if attachments are required; that
would give you more contact with common standards, but potentially
less fidelity to the capabilities of NSAttributedString.
Douglas Davidson
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