The earlier entries in this web log have been spammed with hundreds of trackbacks to sites that are, at least, annoying. The subset of the blojsom web-log server that Apple supplies with Mac OS X Server has no built-in way to remove offending comments or trackbacks. 
 
I'm searching for a solution, and I'll apply it as soon as I can. Sorry. 
 
Update: I've learned how to suppress trackbacks entirely, which does the trick. Apple's blojsom doesn't allow moderation of comments or trackbacks. 

Posted by: Fritz Anderson

In section 7.4 (pages 78-79), I have you set up an NSArrayController for the DataPoint array in the document's model object. NSArrayController needs to know the name of the class of the objects in its array (in this case, DataPoint).  
 
Section 7.4 does not tell you to set the Object Class Name, in the inspector (command-1), to DataPoint. You have to do this for archiving and dearchiving the array in a document to work properly. The sample code accompanying Chapter 7 (and later) does set the class name. 
 
Thanks to Bruce Truax for diagnosing the problem and identifying the fix. 

Posted by: Fritz Anderson