An abstract representation of a Data type containing a
node-set. The type (class) and ordering of the nodes contained in the set
are not defined by this class; instead that behavior should be
defined by NodeSetData subclasses.
Returns a read-only iterator over the nodes contained in this
NodeSetData in
document order. Attempts to modify the returned iterator
via the remove method throw
UnsupportedOperationException.
return
an Iterator over the nodes in this
NodeSetData in document order
