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X-expressions are the unification of S-expressions found in the Lisp programming language with XML. X-expressions unify notions of computation with data sharing.[1]


  1. ^ Repenning, Alexander; Ioannidou, Andri (2007). "X-expressions in XMLisp: S-expressions and Extensible Markup Language Unite". Proceedings of the ACM SIGPLAN International Lisp Conference (ILC 2007) (Cambridge, England: ACM Press).