Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174

Deprecated: Function split() is deprecated in /home3/vvaswani/public_html/community/columns/trog/article.php on line 101

Deprecated: Function eregi_replace() is deprecated in /home3/vvaswani/sql.php on line 301

Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /home3/vvaswani/public_html/community/columns/trog/article.php on line 107

Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /home3/vvaswani/public_html/community/columns/trog/article.php on line 109

Deprecated: Function ereg_replace() is deprecated in /home3/vvaswani/public_html/community/columns/trog/article.php on line 124

Deprecated: Function ereg_replace() is deprecated in /home3/vvaswani/public_html/community/columns/trog/article.php on line 125

Deprecated: Function split() is deprecated in /home3/vvaswani/public_html/community/columns/trog/article.php on line 127

Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174

Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174

Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174

Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174

Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174

Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174

Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174

Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174

Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174

Deprecated: Function ereg() is deprecated in /home3/vvaswani/db-mysql.php on line 174
The Melonfire Community - Trog
Logo         Community
  Trog
Services
The Company
Community
Columns
Your Account
Contact Us
 
 
Sequential XML Processing With The XMLReader Object (part 2)
Validate your XML against DTDs and XML Schemas with the XmlValidatingReader class.

| Onward Ho |

You already know that an XML document may be either "well-formed" or "valid".

A well-formed document is one which meets the specifications laid down in the XML recommendation - that is, it follows the rules for element and attribute names, contains all essential declarations, and has properly-nested elements.

A valid document is one which, in addition to being well-formed, adheres to the rules laid out in a document type definition (DTD) or XML Schema. By imposing some structure on an XML document, a DTD makes it possible for documents to conform to some standard rules, and for applications to avoid nasty surprises in the form of incompatible or invalid data.

DTDs and XML Schemas are essential when managing a large number of XML documents, as they immediately make it possible to apply a standard set of rules to different documents and thereby demand conformance to a common standard. However, for smaller, simpler documents, a DTD can often be overkill, adding substantially to download and processing time.

Now, what does this have to do with the XmlTextReader class I discussed in so much detail in the last segment of this tutorial? Nothing, really. You see, while the class does throw up errors if your XML document isn't well-formed, it does not support validation against a DTD, XDR or XSD Schema. If you need to validate your XML file before processing it, you need to know its close cousin, the XmlValidatingReader object, which is derived from the same abstract XMLReader parent class. And then, once you know how to perform validation, you also need to know how to handle validation errors - which is why this article also includes a simple example that uses built-in exception handling mechanisms to trap errors that the Reader may come across.

Let's get started!


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!


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-
Strict Standards: mktime(): You should be using the time() function instead in /home3/vvaswani/public_html/community/columns/trog/article.php on line 731
2018 Melonfire. All rights reserved
Terms and Conditions | Feedback