pm#declarative_language__declarativelanguage
  supertype:  #programming_language__programminglanguage__programing_language  (computer science) a language designed for programming computers
  subtype:  pm#rule_based_language
     subtype:  pm#purely_declarative_rule_based_language  rule-based language without implicit instructions, e.g., the order between the rules is not important
  subtype:  pm#file_formatting_language
  subtype:  pm#declarative_Web-scripting_language
     subtype:  pm#style_sheet_language__stylesheetlanguage

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