XML Frequently Asked Questions

This is the list of Frequently-Asked Questions about the Extensible Markup Language (XML). It is restricted to questions about XML: if you are seeking answers to questions about SGML, HTML, CGI scripts, Java, databases, or penguins, you may find some pointers, but you should probably look elsewhere as well.

It is intended as a first resource for users, developers, and the interested reader, and does not form part of the XML Specification.

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What is XML?
A.2. What is XML for?
A.3. What is SGML?
A.4. What is HTML?
A.5. Aren't XML, SGML, and HTML all the same thing?
A.6. Who is responsible for XML?
A.7. Why is XML such an important development?
A.8. Why not just carry on extending HTML?
A.9. Why do we need all this SGML stuff? Why not just use Word or Notes?
A.10. Where do I find more information about XML?
A.11. Where can I discuss implementation and development of XML?
A.12. What is the difference between XML and C or C++?

B.1. What do I have to do to use XML?
B.2. Should I use XML instead of HTML?
B.3. Where can I get an XML browser?
B.4. Do I have to switch from SGML or HTML to XML?
B.5. Can I use XML for ordinary office applications?

C.1. Does XML replace HTML?
C.2. Do I have to know HTML or SGML before I learn XML?
C.3. What does an XML document look like inside?
C.4. How does XML handle white-space in my documents?
C.5. Which parts of an XML document are case-sensitive?
C.6. How can I make my existing HTML files work in XML?
C.7. Is there an XML version of HTML?
C.8. If XML is just a subset of SGML, can I use XML files directly with existing SGML tools?
C.9. I'm used to authoring and serving HTML. Can I learn XML easily?
C.10. Can XML use non-Latin characters?
C.11. What's a Document Type Definition (DTD) and where do I get one?
C.12. How do I create my own DTD?
C.13. Can a root element type be explicitly declared in the DTD?
C.14. Does XML let me make up my own tags?
C.15. I keep hearing about alternatives to DTDs. What's a Schema?
C.16. How do I get XML into or out of a database?
C.17. How will XML affect my document links?
C.18. Can I do mathematics using XML?
C.19. How does XML handle metadata?
C.20. Can I use JavaScript, ActiveX, etc in XML files?
C.21. Can I use Java to create or manage XML files?
C.22. How do I execute or run an XML file?
C.23. How do I control formatting and appearance?
C.24. How do I use graphics in XML?
C.25. What is parsing and how do I do it in XML?

D.1. Where's the spec?
D.2. What are these terms DTDless, valid, and well-formed?
D.3. Which should I use in my DTD, attributes or elements?
D.4. What else has changed between SGML and XML?
D.5. What's a namespace?
D.6. What XML software is available?
D.7. Do I have to change any of my server software to work with XML?
D.8. Can I still use server-side inclusions?
D.9. Can I (and my authors) still use client-side inclusions?
D.10. I'm trying to understand the XML Spec: why does it have such difficult terminology?
D.11. I have to do an overview of XML for my manager/client/investor/advisor. What should I mention?
D.12. Is there a conformance test suite for XML processors?
D.13. How do I include one DTD (or fragment) in another?
D.14. I've already got SGML DTDs: how do I convert them for use with XML?
D.15. What's the story on XML and EDI?

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