On Apr 3, 2010, at 8:31 PM, Jens Alfke wrote:

> Ken, he asked for a reference that wouldn't break if the file were moved or 
> renamed. Neither FSrefs nor URLs have that property.

Yes, they do.

From the link I gave 
<http://developer.apple.com/mac/library/documentation/cocoa/conceptual/LowLevelFileMgmt/Articles/FileManagementNSURL.html>:

"File reference URLs provide a way to track a file by its ID. This means that 
the reference is valid even if the file’s name or location in the file system 
changes."

File reference URLs are new with Snow Leopard.  Check out the release notes and 
"What's New in Mac OS X: Mac OS X 10.6" to learn about them.

And FSRefs have always had this property.  Adding file reference URLs was 
essentially a way of allowing URLs to provide analogous functionality as FSRefs.

Regards,
Ken

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