 |
 Rethinking the Datacenter
Sponsored by HP
Today's datacenters need to increase utilization, get control over power and cooling costs, and align with business objectives. Download this eBook to learn about the challenges facing the data center in a world where digital information is growing at a torrid pace and costs are being held in check. Learn more. »
|
|
Putting the Green into IT
Sponsored by HP
Electricity use in data centers is skyrocketing, sending energy bills through the roof, creating environmental concerns and generating negative publicity. "Going Green" means looking to technologies like virtualization, energy-efficient chips and racks, and implementing policies that extend beyond the data center. Learn more. »
|
|
Managing the Modern Network
Sponsored by HP
In a global economy where information crosses the globe in an instant, and where Web-based applications power business, it's more important than ever to ensure your network is safe from threats and optimized to deliver the data your business needs. »
|
|
Evaluating Software as a Service for Your Business
Sponsored by Webroot
Is Software as a Service just hype, or is something really going on here? See if your company can benefit as SaaS tries to change the face of the enterprise.
»
|
|
Is Your Disaster Recovery Plan Good Enough?
Sponsored by HP
Preparing for a disaster is more often than not part of the storage planning process, and it is one of the most difficult tasks, since it includes local hardware and software, networking equipment, and a test plan. Learn how to get disaster recovery right. »
|
|
|
|
|
|
Introduction to XHTML, with eXamples
February 2, 2000
XHTML 1.0
is the first step toward a modular and extensible web
based on XML (Extensible Markup Language).
It provides the bridge for web designers to enter the web of the
future, while still being able to maintain compatibility with today's
HTML 4 browsers.
It is the reformulation of HTML 4 as an application of XML.
It looks very much like
HTML 4,
with a few notable exceptions,
so if you're familiar with HTML 4, XHTML will be easy to learn and use.
XHTML 1.0 was released on January 26th as a Recommendation by the
W3C.
True XHTML version at
EncycloZine.
XHTML in a nutshell
- XHTML tags are all lowercase.
- XHTML is a stricter, tidier version of HTML.
- Pages written in XHTML work well in most browsers.
- All tags, including empty elements, must be closed.
- XHTML is the reformulation of HTML 4.0 as an application of XML.
- The elements (tags) and attributes are almost identical to HTML.
|
How is XHTML better than
HTML?
Extensibility:
Under HTML, an
SGML
(Standard Generalized Markup Language) application,
the addition of a new group of elements requires alteration of the
entire DTD (language specification).
XML is a simplified subset of SGML.
This greatly eases the development and integration of new collections
of elements.
Portability:
By the year 2002 as much as 75% of Internet access could be carried out
on non-PC platforms such as palm computers, televisions,
fridges,
automobiles, telephones, etc.
In most cases these devices will not have the computing power of a
desktop computer, and will not be designed to accommodate
ill-formed HTML
as do
current browsers (bloated with code to handle sloppy or proprietary
HTML).
Learn About XHTML
<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd" >
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title>Quick Example</title>
</head>
<body>
<h1> Quick Example
</h1>
<a href = "http://validator.w3.org/check/referer">
<img src = "http://validator.w3.org/images/vxhtml10"
height = "31"
width = "88"
border = "0"
hspace = "16"
align = "left"
alt = "Valid XHTML 1.0!"
/></a>
<p> Note that the layout (with tabs and alignment) is
purely for readability - XHTML doesn't require it.
</p>
</body>
</html>
Copy this example (qex.html)
to your web server and use it as a template.
Normally you should not
link to images on other people's servers,
but the W3C allows their validation icons to be used in this way.
An overview of the background and limitations of HTML,
and a preview of the advantages to XML.
An overview of the background and advantages to XML.
An explanation of the rôle of DTDs,
and three XML document types that correspond to the three HTML 4.0 DTDs:
Strict, Transitional, and Frameset.
If you want to get into XHTML right away, start here.
If you already know HTML 4, you're well on the way...
Just lots of examples!
- Learn more about XHTML
-
- Write your own XHTML
-
Introduction to XHTML, with eXamples
Introduction to XHTML: Why do we need XHTML?
|
Rethinking the Datacenter
Putting the Green into IT
Managing the Modern Network
Evaluating Software as a Service for Your Business
Is Your Disaster Recovery Plan Good Enough?