“The central idea of the XML family of standards is to separate code from data. The central idea of Lisp is that code and data are the same and should be represented the same. The Lisp community’s idea of “Schema” would likely be “Lisp program”. The Lisp community’s idea of “addressing language” would likely be “Lisp program.” The Lisp community’s idea of “query language” would likely be “Lisp program.” Unfortunately this response ignores the Principle of Least Power.