One Quickie

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Simple archiving (NSCoder->General)

To archive a single object (which can be something like an array or dictionary that contains other object), such as saving your document, do:

- (NSData *) dataRepresentationOfType: (NSString *) aType
{
    NSData *data;
    data = [NSArchiver archivedDataWithRootObject: group];

    return (data);

} // dataRepresentationOfType