Access-control on objects is somehow ambiguous. The objects are combination on data and behaviour. So you have 2 levels of access control - on data and on behaviour.
1. On data level. Usually you get and store the data in some sort of database. You could implement your access-control policy there, in the database. For example look for "Oracle label security", for Postgresql look pgacl (row-level ACL), sepgsql (integration with SELinux security model),veil (view-based sec.policies) etc. You could configure inheritable permissions with some of these tools
2. For behaviour level access control - you could code it yourself, it is very application dependant so there is no good, universal model for doing this - you do it one way for webapp, another way for Tk app etc.
You are working on some CMS, I suppose it has some kind of behaviour level access control. Look there and change the code to fully suit your needs
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