Thanks for replying, From: Andreas Jung [mailto:andreas@andreas-jung.com]
I don't know the implementations details of the "context" object but I consider "context" as read-only. What you want (I think) is to modify the REQUEST by
context.REQUEST.set(key, value).
Hmm, I can't see how this relates to my problem. Let me rephrase it: I've a ZClass ZooExhibit with an attribute like this: ZooExhibit.PropertySheet.ExhibitProperties.last_meal_time I can access last_meal_time as in if (DateTime().timeTime() - context.last_meal_time.timeTime() > 60 * 60 * 8) (This is being used to show information of an instance of the ZClass) But I can't change the value of an attribute of the instance with: context.last_meal_time = DateTime() My problem seems to be a lack of good understanding of what is the context object and its relation with the instance of the ZClass. Cheers, Fernando