Are properties with Access class lists private?

I have the simple class hierarchy below:

classdef myclass
    properties (Access = {?ClassA})
        p=1;
    end
    methods
        function pdisp(obj)
        obj.p
        end
    end
end
classdef mysubclass<myclass
    % properties (Access=public)
    %     p
    % end
    methods
        function pdisp(obj)
           obj.p
        end
    end
end

In this set-up, it appears the p property is effectively private from an inheritance perspective. We can see that mysubclass does not have access to it,

>> sobj = mysubclass;

>> sobj.pdisp

No public property 'p' for class 'mysubclass'.

Error in mysubclass/pdisp (line 10)

obj.p

^^^^^

The documentation does mention that access to properties is not inherited when a class access list is used,

"Access lists are not inherited, so subclasses of PropertyAccess do not have access to Prop2 unless they explicitly define that access."

But what does it mean here to "explicitly define access"? When a parent class has a private property, it is supposed to be possible to redefine that property in the subclass. However, when I uncomment the property redefintiion section in mysubclass, it produces an error.

>> sobj.pdisp

Cannot define property 'p' in class 'mysubclass' because the property has already been defined in the

superclass 'myclass'.

Answer 1

[Catalytic]

Maybe it is because if myclass itself is part of the access list, the property is no longer sealed away from mysubclass --

classdef myclass
    properties (Access = {?ClassA,?myclass})
        p=1;
    end
    methods
        function pdisp(obj)
        obj.p
        end
    end
end

There are probably ways that these different cases could be detected and managed by Matlab in a way that let's you redefine p when it can't be accessed in subclasses, but maybe they don't want to take on that complexity.