Enumeration Case

NSChangeReadOtherContents

The document has been initialized with the contents of a file or file package other than the one whose location is in the fileURL property, and therefore can’t possibly be synchronized with its persistent representation. For example, initForURL:withContentsOfURL:ofType:error: passes this value when the two passed-in URLs are not equal to indicate that an autosaved document is being reopened.

Declaration

NSChangeReadOtherContents = 3