Yup, I'm afraid so. For non default combinations (i.e., for wich there is no predefined fmt string), you have to do a call for each element you extract.
Suggestion for next releases? Isn't it possible to incorporate this? A sort of string parser that analyses the fmt parameter? Other Suggestion : When changing the ID of an object. All documents to which you refer to the old-id have to be edited. What about somewhere an update button, when pressing on it. It iterates through your objects and changes the old-id to the new one. Tom.
Just as an aside: PrincipiaTime has been renamed to ZopeTime. Principia was the old name of the management interface, before it was merged with Bobo into Zope.
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