(simplified) tree

Classic simplified tree diagram of the limerick
	      Warp Speed, Ms Bright! that uses a dashed
	      curved arrow to represent the link from the note
	      to the term, and a dotted arror to indicate the
	      link from the ptr to the Wikipedia article. It is
	      simplified because it does not
	      contain attribute (or text) nodes, and is missing an
Introduction to XML, slide 19 of 30