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The XHTML modularization model defines the
modules of XHTML.
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. |
