Returns the token at the specified index in the list of tokens that can be used as values
for this enumerated attribute type; the returned token has no meaning for other attribute types.
Returns a list of all tokens that can be used as values for this enumerated attribute type;
the returned value has no meaning for other attribute types.
XML4J tree traversal exception which signals from a Visitor to the tree traversal algorithm
that all further traversal should be ended because the visit on the document object
hierarchy has been successfully completed.