Logo         Community
  Trog
Services
The Company
Community
Columns
Your Account
Contact Us
 
 
Using Perl With XML (part 1)
Find out how to use Perl's SAX parser to parse and convert your XML into Web-friendly HTML

| Getting Down To Business  |

Before we get into the nitty-gritty of XML parsing with Perl, I'd like to take some time to explain how all the pieces fit together.

In case you don't already know, XML is a markup language created to help document authors describe the data contained within a document. This description is accomplished by means of tags, very similar in appearance to regular HTML markup. However, where HTML depends on pre-defined tags, XML allows document authors to create their own tags, immediately making it more powerful and flexible. There are some basic rules to be followed when creating an XML file, and a file can only be processed if these rules are followed to the letter.

Once a file has been created, it needs to be converted, or "transformed", from pure data into something a little more readable. XSL, the Extensible Style Language, is typically used for such transformations; it's a powerful language that allows you to generate different output from the same XML data source. For example, you could use different XSL transformations to create an HTML Web page, a WML deck, and an ASCII text file...all from the same source XML.

There's only one problem here: most browsers don't come with an XML parser or an XSL processor. The latest versions of Internet Explorer and Netscape Gecko do support XML, but older versions don't. And this brings up an obvious problem: how do you use an XML data source to generate HTML for these older browsers?

The solution is to insert an additional layer between the client and the server, which takes care of parsing the XML and returning the rendered output to the browser. And that's where Perl comes in - it supports XML parsing, through add-on DOM and XML packages, and even has a package to handle XSL transformations through the Sablotron processor.

As I've said earlier, there are two methods to parse XML data with Perl, and each one has advantages and disadvantages. I'll explain both approaches, together with simple examples to demonstrate how to use them in your own applications.


How to do Everything with PHP & MySQL
How to do Everything with PHP & MySQL, the best-selling book by Melonfire, explains how to take full advantage of PHP's built-in support for MySQL and link the results of database queries to Web pages. You'll get full details on PHP programming and MySQL database development, and then you'll learn to use these two cutting-edge technologies together. Easy-to-follow sample applications include a PHP online shopping cart, a MySQL order tracking system, and a PHP/MySQL news publishing system.

Read more, or grab your copy now!


previous page more like this  print this article  next page
 
Search...
 
In trog...
Logging With PHP
Building A Quick-And-Dirty PHP/MySQL Publishing System
Output Buffering With PHP
Date/Time Processing With PHP
Creating Web Calendars With The PEAR Calendar Class
more...
 
In the hitg report...
Crime Scenes
Animal Attraction
Lord Of The Strings
more...
 
In boombox...
Patience - George Michael
Think Tank - Blur
My Private Nation - Train
more...
 
In colophon...
Hostage - Robert Crais
The Dead Heart - Douglas Kennedy
Right As Rain - George Pelecanos
more...
 
In cut!...
American Chai
The Core
Possession
more...
 
Find out how you can use this article on your own Web site!


Copyright © 1998-2018 Melonfire. All rights reserved
Terms and Conditions | Feedback