eXtropia: the open web technology company
Technology | Support | Tutorials | Development | About Us | Users | Contact Us
Resources
 ::   Tutorials
 ::   Presentations
Perl & CGI tutorials
 ::   Intro to Perl/CGI and HTML Forms
 ::   Intro to Windows Perl
 ::   Intro to Perl 5
 ::   Intro to Perl
 ::   Intro to Perl Taint mode
 ::   Sherlock Holmes and the Case of the Broken CGI Script
 ::   Writing COM Components in Perl

Java tutorials
 ::   Intro to Java
 ::   Cross Browser Java

Misc technical tutorials
 ::   Intro to The Web Application Development Environment
 ::   Introduction to XML
 ::   Intro to Web Design
 ::   Intro to Web Security
 ::   Databases for Web Developers
 ::   UNIX for Web Developers
 ::   Intro to Adobe Photoshop
 ::   Web Programming 101
 ::   Introduction to Microsoft DNA

Misc non-technical tutorials
 ::   Misc Technopreneurship Docs
 ::   What is a Webmaster?
 ::   What is the open source business model?
 ::   Technical writing
 ::   Small and mid-sized businesses on the Web

Offsite tutorials
 ::   ISAPI Perl Primer
 ::   Serving up web server basics
 ::   Introduction to Java (Parts 1 and 2) in Slovak

 

Introduction to XML For Web Developers
Data Versus Markup  

All XML documents may be understood in terms of the data they contain and the markup that describes that data. Data is typically "character data" (letters, numbers, punctuation...anything within the boundaries of valid Unicode) but can also be binary data. Markup includes tags, comments, processing instructions, DTDs, references, etc....

The most simple example of character data and markup would be something like the following:

<NAME>Selena Sol</NAME>

In this case, the <NAME> and </NAME> tags comprise the markup and the "Selena Sol" comprises the character data. As you can imagine there are few rules that manage your data (content) other than what type of data is allowed (binary or ascii for example). On the other hand, there are many rules that define how you must code your markup.

In the rest of this section, we will outline what requirements you must satisfy in order to write well-formed XML.

Previous Page | Next Page | Table of Contents