The book focuses on developing applications for transforming XML documents using XSLT, an extensible style language for transformations. The use of XSLT and XPath languages ​ ​ in solving practical problems is discussed: displaying documents in HTML format, using various encodings for internationalization and, in particular, Russification of applications, questions of the effectiveness of existing approaches to solving transformation problems. A large number of examples are used to illustrate the material.