[Zope] Adding new _properties

[Chris Withers]

> After that, I cannt read old objects of this class. Zope write:
> Site Error
> An error was encountered while publishing this resource. 
> Error Type: AttributeError
> Error Value: n1
> 
> How can I solve this problem?

class easyArticle(SimpleItem.SimpleItem):
     n1 = 0.0
     n2 = 0.0
     _properties = (
         {'id':'author', 'type':'string', 'mode':'w'},
         {'id':'n1','type':'float', 'mode':'w'},
         {'id':'n2','type':'float', 'mode':'w'}
     )

cheers,

Chris

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