February 2006
Intermediate to advanced
826 pages
63h 42m
English
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XML declaration
XHTML (and other XML) documents often begin with an XML declaration before the DOCTYPE declaration. The XML declaration is not required. The declaration may include the encoding of the document, as shown in this example.
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">The XML declaration may be provided even for XHTML documents
served as text/html.
Because the default encoding for all XML documents is UTF-8 or UTF-16, encoding information in the XML declaration is not required for these encodings, and thus can be omitted as a space-saving optimization.
In addition, although it is technically correct to include the XML declaration in such documents, Appendix C of the XHTML 1.0 specification, “HTML Compatibility Guidelines,” recommends avoiding it, and many authors choose to omit it because of browser-support issues. For example, when Internet Explorer 6 for Windows detects a line of text before the DOCTYPE declaration, it converts to Quirks Mode (see Chapter 9 for details), which can have a damaging effect on how the documents styles are rendered. (This is reportedly fixed in IE 7.) It is required only if your document uses an encoding other than UTF-8 or UTF-16 and if the encoding has not been set on the server.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.