Chinese XML FAQ (in English) - FAQ about Chinese document encodings, and how they relate to XML. Also includes links and software.
Entry-Level Unicode for XML - A "just enough education to perform" guide to Unicode and ISO 10646 for authors of XML parsers and other software that processes XML.
Expressing Simple Dublin Core in RDF/XML - Explains how to encode the Dublin Core Metadata Element Set V1.1 (DCMES) in XML, provides a DTD to validate the documents and describes a method to link them from web pages.
History of Unicode Standard(s) - What document(s) define(d) the Unicode standard? This is a complete history of the Unicode standard from 1.0 to a preview of the (future) 3.0 and 4.0 versions to come.
ISO 8859 Alphabet Soup - A commented graphical overview of the ISO 8859 character sets by Roman Czyborra.
MSDN: How to Encode XML Data - Article explaining how character encoding works and specifically how it works in XML and the MSXML DOM.
The Unicode Consortium - The official site with information and resources for programmers, implementers and others involved in computer globalization work.
What ASN.1 can offer to XML - XML Encoding Rules for Abstract Syntax Notation One (ASN.1) and the ASN.1 Markup Language [ITU-T Rec. X.693 | ISO/IEC 8825-4].
W3Schools.com: XML Encoding - XML documents can contain foreign characters like Norwegian æøå, or French êèé. To let your XML parser understand these characters, you should save your XML documents as Unicode.