XHTML Essential(2)- XHTML DTD,Vaidation,Modularization

4.XHTML DTD
The XHTML standard defines three Document Type Definitions.
The most common is the XHTML Transitional.
The 3 Document Type Definitions
DTD specifies the syntax of a web page in SGML.
DTD is used by SGML applications, such as HTML, to specify rules that apply to the markup of documents of a particular type, including a set of element and entity declarations.
XHTML is specified in an SGML document type definition or 'DTD'.
An XHTML DTD describes in precise, computer-readable language, the allowed syntax and grammar of XHTML markup.
There are currently 3 XHTML document types:
STRICT
TRANSITIONAL
FRAMESET
XHTML 1.0 specifies three XML document types that correspond to three DTDs: Strict, Transitional, and Frameset.
XHTML 1.0 Strict
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
Use this when you want really clean markup, free of presentational clutter. Use this together with Cascading Style Sheets.
XHTML 1.0 Transitional
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Use this when you need to take advantage of HTML's presentational features and when you want to support browsers that don't understand Cascading Style Sheets.
XHTML 1.0 Frameset
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
Use this when you want to use HTML Frames to partition the browser window into two or more frames.

5.Vaidation Your WebSit 
click the follow url to vaidation your websit.
http://www.w3schools.com/site/site_validate.asp

6.Modularization
Why XHTML Modularization?

XHTML is a simple, but large language. XHTML contains most of the functionality a web developer will need.

For some purposes XHTML is too large and complex, and for other purposes it is much too simple.

By splitting XHTML into modules, the W3C (World Wide web Consortium) has created small and well-defined sets of XHTML elements that can be used separately for simple devices as well as combined with other XML standards into larger and more complex applications.

With modular XHTML, product and application designers can:
Choose the elements to be supported by a device using standard XHTML building blocks.
Add extensions to XHTML, using XML, without breaking the XHTML standard.
Simplify XHTML for devices like hand held computers, mobile phones, TV, and home appliances.
Extend XHTML for complex applications by adding new XML functionality (like MathML, SVG, Voice and Multimedia).
Define XHTML profiles like XHTML Basic (a subset of XHTML for mobile devices).
XHTML Modules

W3C has split the definition of XHTML into 28 modules:
Module name	Description	
Applet Module	Defines the deprecated* applet element.	
Base Module	Defines the base element.	
Basic Forms Module	Defines the basic forms elements.	
Basic Tables Module	Defines the basic table elements.	
Bi-directional Text Module	Defines the bdo element.	
Client Image Map Module	Defines browser side image map elements.	
Edit Module	Defines the editing elements del and ins.	
Forms Module	Defines all elements used in forms.	
Frames Module	Defines the frameset elements.	
Hypertext Module	Defines the a element.	
Iframe Module	Defines the iframe element.	
Image Module	Defines the img element.	
Intrinsic Events Module	Defines event attributes like onblur and onchange.	
Legacy Module	Defines deprecated* elements and attributes.	
Link Module	Defines the link element.	
List Module	Defines the list elements ol, li, ul, dd, dt, and dl.	
Metainformation Module	Defines the meta element.	
Name Identification Module	Defines the deprecated* name attribute.	
Object Module	Defines the object and param elements.	
Presentation Module	Defines presentation elements like b and i.	
Scripting Module	Defines the script and noscript elements.	
Server Image Map Module	Defines server side image map elements.	
Structure Module	Defines the elements html, head, title and body.	
Style Attribute Module	Defines the style attribute.	
Style Sheet Module	Defines the style element.	
Tables Module	Defines the elements used in tables.	
Target Module	Defines the target attribute.	
Text Module	Defines text container elements like p and h1.

* Deprecated elements should not be used in XHTML.

posted on 2006-04-13 11:42 asdfasdf 阅读(186) 评论(0) 收藏举报

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