Central service of the Accessibility API that gives access to various
facets of an object's content.
This service has to be implemented by every class that represents the
actual accessibility information of another UNO service. It exposes two
kinds of information: A tree structure in which all accessible objects
are organized can be navigated in freely. It typically represents
spatial relationship of one object containing a set of children like a
dialog box contains a set of buttons. Additionally the
XAccessibleContext interface of this service exposes
methods that provide access to the actual object's content. This can be
the object's role, name, description, and so on.
