XHTML or eXtensible Hypertext Markup Language is a real effort to clean up code creation by making the rules of coding very strict. It is a new standard of HTML (after HTML 4.0), and in essence bridges the gap between HTML and the more powerful XML.
Last Revised: 2015-07-01
Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format which is both human-readable and machine-readable. It is defined by the W3C's XML 1.0 Specification, and by several other related specifications, all of which are free open standards.
The design goals of XML emphasize simplicity, generality and usability across the Internet. It is a textual data format with strong support via Unicode for different human languages. Although the design of XML focuses on documents, it is widely used for the representation of arbitrary data structures such as those used in web services.
Last Revised: 2015-08-26