Compilers ”Principles, Techniques, and Tools , by Alfred V. Aho, Ravi Sethi, and Jeffrey D. Ullman (Reading, MA: Addison-Wesley, 1988). This is the classic textbook on compiler construction. It is known as the "dragon book," from the cover illustration of a knight doing battle with a dragon.
Unicode information can be found at http://www.unicode.org.
XML Schema Recommendation, by World Wide Web Consortium. Base URL http://www.w3.org/TR/.
Part 0: Primer, xmlschema-0.html
Part 1: Structures, xmlschema-1.html
Part 2: Datatypes, xmlschema-2.html