Is there an equivalent to the Business Intelligence (BI) classes in IRIS ?

I have migrated one project from CACHE to IRIS that contains lot of classes that inherit from BI (Business Intelligence).

Usually it looks like this : 

Class User.Foo Extends (%Library.Persistent, %XML.Adaptor, %BI.Adaptor)
{
}

I was wondering if there is an equivalent of those classes in IRIS, and, if not, if there is a workaround that would allow me to at least le me compile those classes.

I tried to create an empty class like that : 

Class %BI.Adaptor
{
}

But I got the following error in Studio : 

5883    Item '%BI.Adaptor' is mapped from a database that you do not have write permission on.

Which make sense since AFAIK this class is a system class which reside in %SYS namespace.