| http://www.w3.org/ns/prov#value | - And many if not most methods of the Cocoa frameworks that take and return values such as strings, numbers, and dates require that these values be encapsulated in objects. (With string values, in particular, you should always use NSString objects and not C-strings.) Some classes for value objects have mutable and immutable variants???for example, there are the NSMutableData and NSData classes.
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