public class XBNillableElem<T>
extends java.lang.Object
A wrapper class used to represent nillable elements.
The value of the nillable element's type is held in elemValue. The isNilled
flag indicates whether the element has been nilled or not. For a nilled
element of complex type, whether a given filed in elemValue is used or not
depends on whether it represents an atttribute (it will be used) or an
element (it will not be used).