Implement this interface to give access to an object's set of relations.
Such relation are modeled with the AccessibleRelation
structure. This interface is used for representing sets of relations
between Accessible objects. Most of the convenience
methods of the corresponding AccessibleRelationSet interface of the Java
Accessibility API have been removed from this interface in order to
clean it up. These methods are add,
addAll, clear, and
remove. The other methods have been renamed to achieve
a geater conformance with the other accessibility interfaces.
Returns the relation of this relation set that is specified by
the given index.
Parameter nIndex
This index specifies the relatio to return.
Returns
For a valid index, i.e. inside the range 0 to the number of
relations minus one, the returned value is the requested
relation. If the index is invalid then the returned relation
has the type INVALID.