Официальная документация

1. XML - http://www.w3.org/TR/1998/REC-xml-19980210
2. XML v. 1.0 DTD - http://www.w3.org/XML/1998/06/xmlspec-19980910.dtd
3. XSL - http://www.w3.org/TR/1998/WD-xsl-19980818
4. Document Object Model (DOM) Level 1 Specification - http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/
5. SGML-XML - http://www.w3.org/TR/NOTE-sgml-xml
6. Document Content Description for XML - http://w3c.org/TR/NOTE-dcd
7. CSS2 - http://www.w3.org/TR/REC-CSS2
8. HTML - http://www.w3.org/TR/1998/REC-xml-19980210.html
9. Channel Definition Format (CDF) - http://www.microsoft.com/standards/cdf.htm
10. ISO 8879. Information Processing -- Text and Office Systems - Standard Generalized Markup Language (SGML), 1986. - http://www.iso.ch/cate/d16387.html
11. Namespaces in XML World Wide Web Consortium Working Draft 16-September-1998 - http://www.w3.org/TR/WD-xml-names
12. XML-Data W3C Note 05 Jan 1998 - http://www.w3.org/TR/1998/NOTE-XML-data-0105/

 Статьи, спецификации, ссылки на ресурсы

13. The SGML/XML Web Page - http://www.oasis-open.org/cover/sgml-xml.html
14. The SGML/XML Web Page - Extensible Markup Language (XML) - http://www.oasis-open.org/cover/xml.html
15. The SGML/XML Web Page - Extensible Style Language (XSL - http://www.oasis-open.org/cover/xsl.html
16. The SGML/XML Web Page - Public SGML/XML Software - http://www.oasis-open.org/cover/publicSW.html
17. he SGML/XML Web Page - SGML/XML Bibliograph - http://www.oasis-open.org/cover/biblio.html

18. Чего мы ждем от XMLШелли Пауэрс(Мир ПК 3/1998 г.) - http://www.osp.ru/pcworld/1998/03/180.htm

19. Overview of SGML Resources - http://www.w3.org/MarkUp/SGML/
20. XML/XSL Resources - from Bryan Van Hook - http://capita.wustl.edu/XMLRes/
21. XML News and Links - http://www.arbortext.com/News_and_Events/XML_News_and_Links/xml_news_and_links.html
22. XML Resources - http://www.microsoft.com/xml/xmllinks.asp
23. SGML Syntax Summary Table of Contents - http://www.sil.org/htbin/sgml-redirect/sgml/sgmlsyn/contents.htm
24. XML Community - http://www.inso.com/xml/index.htm

Microsoft XML

25. Inside the XML 1.0 Specification - http://www.xml.com/xml/pub/axml/axmlintro.html
26. XML Overview - http://www.microsoft.com/xml/OVERVIEW.asp
27. XML Data types - http://www.microsoft.com/workshop/xml/schema/reference/datatypes.asp
28. Microsoft XML Tutorial - http://www.microsoft.com/xml/tutorial/default.asp
29. Building XML Parsers for Microsoft's IE4 - http://w3j.com/xml/excerpt.html
30. XML 1.0 and Namespace Support - http://www.microsoft.com/xml/xml10andNameSpaceSupport.asp

XSL

31. Using XSL and CSS together
    W3C Note, 11 September 1998 - http://www.w3.org/TR/1998/NOTE-XSL-and-CSS-19980911
32. An Introduction to XSL by Henry S. Thompson HCRC Language Technology Group University of Edinburgh, Oct 27 1997 - http://www.ltg.ed.ac.uk/~ht/swindon.html
33. Understanding XSL
    by Jay Greenspan  28 October 1998 - http://www.hotwired.com/webmonkey/98/43/index2a.html
34. XSL Tutorials by Frank Boumphrey. - http://www.hypermedic.com/style/xsl/
35. "The MSXSL XSL Processor." Presentation made by Sean McGrath to SGML UK (SGML Users' Group) Tuesday, March 31, 1998. - http://www.sgml.org.uk/slides/xsl95/

Схемы

36. XML Schema and Data Types Preview - http://www.microsoft.com/xml/schema/reference/start.asp
37. Resource Description Framework
    (RDF) Schema Specification - http://www.w3.org/TR/WD-rdf-schema/
38. Schema for Object-Oriented XML (SOX) - http://www.w3.org/TR/NOTE-SOX/
39. XML Parsers/Processors - http://www.xmlsoftware.com/parsers/
40. A Lexical Analyzer for HTML and Basic SGML - http://www.w3.org/MarkUp/SGML/sgml-lex/sgml-lex
41. UNC Sunsite WWW [and FTP] Server, maintained by W3C XML Chair, Jon Bosak - http://sunsite.unc.edu/pub/sun-info/standards/xml/
42. XML Editors - http://www.xmlsoftware.com/editors/
43. Applications development models - http://www.xml.com/xml/pub/Applications
44. XML.com Guide to Authoring Tools - http://www.xml.com/xml/pub/authortools
45. Tools - XML and SGML tools including parsers - http://www.xml.com/xml/pub/Tools

FAQ

46. Frequently Asked Questions about the Extensible Markup Language(The XML FAQ ) - http://www.ucc.ie/xml/
47. Extensible Markup Language Frequently Asked Questions( XML FAQ) - http://www.textuality.com/xml/faq.html
48. "20 Questions About XML." By Trisha Gorman. - http://builder.cnet.com/Authoring/Xml20/index.html

Информация по некоторым языкам разметки, производным от XML 

49. Meta Content Framework Using XML - http://www.textuality.com/mcf/NOTE-MCF-XML.html;
50. Resource Description Framework (RDF) - http://www.w3.org/RDF/
51. Synchronized Multimedia Integration Language (SMIL) - http://www.w3.org/AudioVideo/
52. Mathematical Markup Language (MathML) - http://www.w3.org/Math/
53. CML - Chemical Markup Language - http://www.oasis-open.org/cover/cml1.html
54. TML(Tutorial Markup Language) Specification - http://www.ilrt.bris.ac.uk
55. XLF (Extensible Log Format) Initiative - http://www.docuverse.com/xlf/
56. Metafile for Interactive Documents (MID) - http://www.oasis-open.org/cover/gen-apps.html#mid

XML Web

57. XML.COM - http://www.xml.com
58. XMLINFO.COM - http://www.xmlinfo.com/
59. SCHEMA.NET - http://www.schema.net/

60. Robin Coverґs SGML/XML Pages  - http://www.oasis-open.org/cover/

61. Microsoft's XML Web Site - http://www.microsoft.com/xml/
62. Microsoft's XSL Web Site - http://www.microsoft.com/xml/xsl
63. ArborText's XML resources page - http://www.arbortext.com/xmlresrc.html
64. Charles F. Goldfarb's SGML SOURCE HOME PAGE - http://www.sgmlsource.com/
65. DataChannel XML Resource Center - http://www.datachannel.com/xml_resources/
66. DEVELOPER.COM - XML Directory - http://www.developer.com/directories/pages/dir.xml.html
67. POET XML resource library - http://www.poet.com/xml/