content: The book does not focus on the "Scientific and technical" side (only 1/3 of the chapters). Maybe that is why the subtitle has disappeared from the cover. Chapters 1-9 and 21-24 are generalities about XML and XML-aware applications. These would have been much clearer if the authors omitted to present all these useless options such as PUBLIC identifiers. Chapters 10, 11 and annex A paraphrase the MathML specifications. The MathML specs, freely downloadable online, are unusually clear themselves so the book does not bring much. I would have liked a word about the XSIL format, an index for the CD, and a correct table of content. I understand that if the authors had taken the time to write a well focused and pedagogical text, it would have been obsolete before publishing. Yet I am still looking for a book on XML for scientists.