In April 2001, the W3C's HTML Working Group released the “Modularization of XHTML” document as a W3C recommendation. It can be found at
The recommendation breaks down the XHTML 1.0 specification into abstract modules, each module containing related elements and attributes. This modular approach forms the basis for all further development in XHTML because future versions need simply declare new or updated modules. This is the approach taken in XHTML 1.1 and XHTML Basic.
Specifying an HTML-based markup language in modules has a number of benefits, including
Modularization provides a consistent framework for defining HTML-based XML languages.
Modularization means ...