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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Extensible Stylesheet Language
   XSL
      <web> (XSL) A standard developed by the World
    Wide Web Consortium defining a language for transforming and
      formatting XML (eXtensible Markup Language) documents.
      An XSL stylesheet is written in XML and consists of
      instructions for tree transformation and formatting.  The tree
      transformations describe how each XML tag relates to other
      data and the formatting instructions describe how to output
      the various types of data.
      (http://w3.org/Style/XSL/).
      See also Extensible Stylesheet Language Transformations.
      (2005-09-30)