| Running Scared |
If you've been playing with XML for a while, you probably already know that XML documents come in two flavours: well-formed and valid.
A well-formed document is one which meets the specifications laid down in the XML recommendation - that it, it follows the rules for element and attribute names, contains all essential declarations, and has
A valid document is one which, in addition to being well-formed, adheres to the rules laid out in a 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.
If you're serious about developing your XML skill set, you're going to bump your head up against DTDs sooner or later - and the arcane commands and symbols you find will make you want to weep and beg for Mommy. Unless, of course, you're armed with your own secret weapon...
Over the course of the next few pages, I'm going to find out just what makes a DTD tick, with examples, explanations and illustrations that will demystify this simple yet surprisingly-scary piece of the XML puzzle. Strap yourself in, and prepare to meet the beast!
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!