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Sample (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 l.
A Hurried Introduction to XML, slide 13 of 24 © 2007 Syd Bauman, Julia Flanders, and Brown WWP