1, yes yes XHTML what? 

  html is a Basic WEB page design language, XHTML is an XML-based markup language, HTML and some look alike, but there are some small but important distinction, XHTML is a similar HTML play the role of XML, , in essence, said, XHTML is a transitional technology, combined with a XML (a bit) and the power of HTML (the majority) of the simple. 

  By the end of 2000, the international w3c (World Wide Web Consortium) announced organizations issued XHTML version 1.0.    XHTML 1.0 is a basis in HTML 4.0 optimization and improvement of the new language, XML-based application to.    XHTML is an enhanced HTML, its scalability and flexibility to adapt to future network applications demand more.    Below are the W3C's HTML Working Group Chairman Steven Pemberton XHTML answer on the basis of a common problem. 

  Q: What is XHTML? 

  Answer: To meet the XHTML XML is a kind of re-transformation of HTML.    When XML is increasingly becoming a trend, and there have been such an issue: If we have XML, we still need HTML? In order to answer this question, in May 1998 in San Francisco, the two-day working session, the meeting Conclusion: need.    We still need to use HTML.    Because a lot of people have been accustomed to using HTML as a language of their design, and has several millions of pages prepared by using HTML. 

  Q: Why XHTML 1.0 HTML 4.0 relatively independent development? 

  Answer: is not the case.    XHTML is precisely the re-organization HTML 4.0, (say it is the exact HTML 4.01, is a modified version of the HTML 4.0, but 1.0 to XHTML naming issue.) Their interpretation in XML, there will be some necessary differences, but on the other On the one hand, they are still very similar, we can work as XHTML 4.0 is based on HTML extension. 

  Q: how to achieve 1.0 XHTML XML standard? 

  Answer: XHTML is an XML application.    It uses the XML DTD file format definition, and running XML support in the system.    Here, we must thank the XML Namespaces function, the browser manufacturers do not need to create new private labels (tags), they only need to XHTML code contains XML code fragment, or XML code fragment contains XHTML code. 

  2, compared with XHTML and HTML What are the characteristics? 

  (1) HTML language XHTML solve the serious constraints on their development.    HTML development today there are three major drawbacks: can not meet the needs now more and more network equipment and application needs, such as cell phones, PDA, information appliances are not directly Display HTML Because HTML code not standardized, bloated, the browser needs adequate intelligence and huge can display HTML properly, data and the mixed performance, so you want to change pages that must be re-produced HTML.    Hence the need to develop HTML can solve this problem, then we enacted the W3C XHTML, HTML to XHTML XML is over a bridge. 

  (2) XML web development is the trend, it seems urgent desire to join the trend of XML.    XHTML is the alternative HTML4 markup language standards, the use of XHTML 1.0, as long as you carefully follow some simple rules, we can design a system suited to XML, and for most of the current browser HTML pages.    This means, that is to say, you can immediately design XML, without the need to wait until the people have to support the use of XML browser.    The guidelines will enable web smooth transition to XML. 

  (3) the use of XHTML Another advantage: it is very tight.    The current network of HTML on the worst-case scenario were shocking, early browser to accept private HTML tags, so people in the page design must be used after all browser detection pages to see if compatible, there are often many baffling The difference, people have to modify the design in order to adapt to different browser. 

  (4) is XHTML with other XML-based markup language, application procedures and good agreement interactive work.    . 

  (5) XHTML web standards is a part of the family, in good will and other wireless devices on the user agent. 

  (6) In website design, XHTML can help you remove the bad habit of performance of the code, and help you develop calibration markers to test pages work habits.