Mac OS X uses XML as its General/PropertyListFormat. The format looks like this:
<!DOCTYPE plist SYSTEM “file://localhost/System/Library/General/DTDs/General/PropertyList.dtd”>
You can typically read and write General/XmlPropertyLists using Foundation objects' -initWithContentsOfFile: and -writeToFile:atomically: methods.
For example, if you have a property list "General/ExampleArray.plist" in your project whose root is an array, you can read it with this snippet:
General/NSArray array* = General/[NSArray arrayWithContentsOfFile:
General/[[NSBundle bundleForClass:[self class]] pathForResource:@"General/ExampleArray" ofType:@"plist"]];
Mac OS X supports an older property list format known as General/AsciiPropertyLists.
You can convert an XML property list to the old ascii format with the 'pl' command (although some types are not supported in the old format). General/TextExtras will also allow a menu option to convert back and fourth.
See also General/PropertyList.