3 links
Character Encoding, XML, and MSXML
msdn.microsoft.com
Excerpt from the Microsoft XML 3.0 - XML Developer's Guide page on character encoding.
The Unicode Consortium
unicode.org
The official Unicode web site provides extensive information and resources for programmers, implementers and others involved in computer globalization work.
XML Spy Online Manual: Unicode Support
xmlspy.com
Description of the Unicode and character-set encoding support in this XML editor. Includes detailed explanation of Unicode, character-set, and font issues with the various Windows …