f this flag determines whether the children of entity
 reference nodes are visible to the iterator. If false, they will be
 skipped over.
 <br> To produce a view of the document that has entity references
 expanded and does not expose the entity reference node itself, use the
 whatToShow flags to hide the entity reference node and set
 expandEntityReferences to true when creating the iterator. To produce
 a view of the document that has entity reference nodes but no entity
 expansion, use the whatToShow fla