code: public int getNextSibling(int nodeHandle)
    {
    	if (nodeHandle == DTM.NULL)
    	return DTM.NULL;
      return makeNodeHandle(_nextsib(makeNodeIdentity(nodeHandle)));
    }
docs: Given a node handle, advance to its next sibling.
  If not yet resolved, waits for more nodes to be added to the document and
  tries again.
  @param nodeHandle int Handle of the node.
  @return int Node-number of next sibling,
  or DTM.NULL to indicate none exists.