XML requires style languages to implement its functionalities completely.The two major functions of style languages are file transformation and formatting since DSSSL on the SGML arena.XSL follows the approaches of DSSSL,processing XML files as a tree,and there is only one feasible template for each node in that tree.The functions and characteristics of the two essential components of XSL,XSLT and XSL FO are briefly introduced,then the state of the art of XML data presentations is summarized.
