One Quickie

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Reading property lists from XML (XML->General)

This will read property lists in XML (or any of the other property list formats:)

    NSData *data = // get NSData from somewhere, like NSFileManager
    if (data) {
        myRootObject = [NSPropertyListSerialization
                           propertyListFromData: data
                           mutabilityOption: NSPropertyListMutableContainers
                           format: nil
                           errorDescription: nil];
    }

For the mutability options of the resulting object, you can also use NSPropertyListImmutable and NSPropertyListMutableContainersAndLeaves