To make python objects accessible and usable by the
ocempgui.access module and layers, the
objects have to inherit from the Accessible
class. It provides a single method interface,
get_accessible_context(), which has to
return a AccessibleContext object for the
specific python object.
Dependant on the capabilities of the python object and the
information it provides, it has to set up several attributes of
the AccessibleContext, it will return.
The accessible module is in an early stage and currently does not perform anything useful.