One Quickie

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Simple unarchiving (NSCoder->General)

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

- (BOOL) loadDataRepresentation: (NSData *) data
                         ofType: (NSString *) aType
{
    // replace the moedl
    [group release];
    group = [NSUnarchiver unarchiveObjectWithData: data];
    [group retain];

    // make any associations to hook the new data into your document

    return (YES);

} // loadDataRepresentation