Документация и стандарты XML

Larry Wall, Clark Cooper
XML::Parser - A perl module of parsing XML documents

This module provides ways to parse XML documents. It is built on top of XML::Parser::Expat, which is a lower level interface to James Clark's expat library

Александр Печерский
Язык XML: практическое введение, части первая и вторая

Наиболее полное и лучшее руководство по языку XML на русском языке.

Eoin Lane
Linux, Java and XML

This article is a basic introduction to the new web markup language XML and the transformation language XSL. Here I show how the Apache web server can be configured using the servlet engine JServ, to do client side XML/XSL transformation using Apache's Cocoon servlet (December 1999).

W3C, 24 June 1999
WAP Binary XML Content Format

Data Networks and Open System Communications, 21 April 1999
Specifications of XML Encoding Rules (XER)

Luke Andrew Cassady-Dorion
Special Edition Using HTML 4. Chapter 33: Understanding XML

W3C, 14 January 1999
Namespaces in XML

W3C, 10 Febrary 1998
Extensible Markup Language (XML) 1.0