XHTML standards are actually implemented by W3 Consortium since 1999. However I am sure there are still many people who do not understand what and how standard XHTML.

XHTML stands for Extensible itself a markup language for hypertext. In its website, W3 Consortium, said that standards for XHTML is the reformulation of HTML documents to XML syntax, designed to replace HTML.

In the terminology of XHTML, display or presentation of data is separated from the data. Also XHTML rules stricter than HTML.

Since XML-based XHTML, then we can use various tools and technologies specific to the XML (such as MathML, SVG, WSDL, SOAP) in XHTML document

There are four main goals separated display (UI) and data, namely:

1. Accessibility

W3C XHTML, not only intended to be accessible to normal people, but also for people who have physical handicaps (disabilities). For example, blind people can use screen readers and voice browsers to access the site.

2. Target Presentation

If we separate the presentation layer of data, we can create different views for different devices. The same data source, but can be used by various devices. More practical and effective?

3. Support

Data storage and display separate structure will help us in organizing the site. In later days, if we want to manipulate a website (for example, change the appearance), it will be easier to do.

4. Processing

Software (eg web browser) is easier for processing XHTML documents for more regular organization of data and separation of display and data structures.

In addition, standard XHTML web documents are only accessible via a web browser alone. Mobile phones and personal digital assistants (PDA) access to web documents with Wireless Markup Language (WML) and XHTML Basic.

WML is an XML vocabulary created specifically for mobile phones that support Protocol Wireless Application Protocol (WAP). Although it is XHTML XHTML Basic consists of the basic tags and the text itself.