Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Poorly Explained Material

This book suffers badly from two problems: multiple authors and padding. Padding makes some of the sections too "chatty", while paradoxically failing in providing a good explanation of the material. Multiple authors makes the quality of the content sections very variable. At best they are adequate, at worst appauling.Take the XML Schema chapter. Its painful to read, with complex examples badly explained and a more or less random list of individual features explained not very well. Understanding XML Schema by reading this chapter is like learning a foreign language by reading a dictionary.There are FAR better choices for XML coverage, such as the OReilly series.