p. xiii: In the paragraph about Part V, "XHTML is a reformulation of HTML 4.0 whose out come is valid XML" should be "XHTML is a reformulation of HTML 4.0 as valid XML".
p. xiv: In the second paragraph, "Even if you can't load your XML documents directly into a Web browser, you can still convert them to XML documents and view those." should be "Even if you can't load your XML documents directly into a Web browser, you can still convert them to HTML documents and view those."