Skip to Content
XML in a Nutshell, 3rd Edition
book

XML in a Nutshell, 3rd Edition

by Elliotte Rusty Harold, W. Scott Means
September 2004
Intermediate to advanced
712 pages
24h 45m
English
O'Reilly Media, Inc.
Content preview from XML in a Nutshell, 3rd Edition

Three DTDs for XHTML

XHTML comes in three flavors, depending on which DTD you choose:

Strict

This is the W3C’s recommended form of XHTML. This includes all the basic elements and attributes such as p and class. However, it does not include deprecated elements and attributes such as applet and center. It also forbids the use of presentational attributes such as the body element’s bgcolor, vlink, link, and text. These capabilities are provided by CSS instead. Strict XHTML is identified with this DOCTYPE declaration:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
                      "DTD/xhtml1-strict.dtd" >

Example 7-2 uses this DTD.

Transitional

This is a looser form of XHTML for when you can’t easily do without deprecated elements and attributes, such as applet and bgcolor. It is identified with this DOCTYPE declaration:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
                      "DTD/xhtml1-transitional.dtd" >
Frameset

This is the same as the transitional DTD except that it also allows frame-related elements, such as frameset and iframe. It is identified with this DOCTYPE declaration:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
                      "DTD/xhtml1-frameset.dtd" >

All three DTDs use the same http://www.w3.org/1999/xhtml namespace. You should choose the strict DTD unless you’ve got a specific reason to use another one.

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

XML: Visual QuickStart Guide, Second Edition

XML: Visual QuickStart Guide, Second Edition

Kevin Howard Goldberg
XML Hacks

XML Hacks

Michael Fitzgerald

Publisher Resources

ISBN: 0596007647Errata PageSupplemental Content