[Zope] fine grained, dynamic permissions based on attribute values

[Chris Crownhart]

Good day,

I am wondering if/how I could control the permissions on an object based 
on the value of an attribute.  I am using CMF, and thus portal_catalog, 
and have built a custom content type.  My type has a category field.  I 
would like to control the view permission of the object dynamically 
based on the value of category.

So, as an example, I have multiple users, and multiple values for the 
category field.  I would like User A to access the object if the 
category ='financial', and User B access the object if the 
category='other'.

Thanks for any ideas.

Chris