First of all, I cannot believe someone like Inmon, the father of Data Warehouse, cannot draw a good diagram to illustrate his ideas. Or even hire one to do it for him! Almost all of the diagrams seem so rushed out. Many of them seem so pointless that i cannot understand why they were even included!
OK, rant over. Let's continue...
IMO, the most interesting part of the book was the "textual disambiguation" in order to appoint meaning to words extracted from emails and apply a context, but it was an abstract illustration of ideas.
Even though all the topics in this book are very important with many useful applications, there is a lack of examples and practical illustration of the ideas and techniques. Comparing this book to Kimball's The Data Warehouse Toolkit, I expected more practical examples, not silly abstract ill-drawn diagrams. It seems that the author leaves the practical/technical application of the ideas to the reader.
I wouldn't suggest this book to anyone. I would search for another book that illustrates the ideas in a more practical way.