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diff --git a/src/util/language.h b/src/util/language.h
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+/*********************                                                        */
+/*! \file language.h
+ ** \verbatim
+ ** Original author: mdeters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief Definition of input and output languages
+ **
+ ** Definition of input and output languages.
+ **/
+
+#include "cvc4_public.h"
+
+#ifndef __CVC4__LANGUAGE_H
+#define __CVC4__LANGUAGE_H
+
+#include <sstream>
+#include <string>
+
+#include "util/exception.h"
+
+namespace CVC4 {
+namespace language {
+
+namespace input {
+
+enum Language {
+  // SPECIAL "NON-LANGUAGE" LANGUAGES HAVE ENUM VALUE < 0
+
+  /** Auto-detect the language */
+  LANG_AUTO = -1,
+
+  // COMMON INPUT AND OUTPUT LANGUAGES HAVE ENUM VALUES IN [0,999]
+  // AND SHOULD CORRESPOND IN PLACEMENT WITH OUTPUTLANGUAGE
+  //
+  // EVEN IF A LANGUAGE ISN'T CURRENTLY SUPPORTED AS AN INPUT OR
+  // OUTPUT LANGUAGE, IF IT IS "IN PRINCIPLE" A COMMON LANGUAGE,
+  // INCLUDE IT HERE
+
+  /** The SMTLIB input language */
+  LANG_SMTLIB = 0,
+  /** The SMTLIB v2 input language */
+  LANG_SMTLIB_V2,
+  /** The CVC4 input language */
+  LANG_CVC4
+
+  // START INPUT-ONLY LANGUAGES AT ENUM VALUE 1000
+  // THESE ARE IN PRINCIPLE NOT POSSIBLE OUTPUT LANGUAGES
+
+};/* enum Language */
+
+inline std::ostream& operator<<(std::ostream& out, Language lang) {
+  switch(lang) {
+  case LANG_SMTLIB:
+    out << "LANG_SMTLIB";
+    break;
+  case LANG_SMTLIB_V2:
+    out << "LANG_SMTLIB_V2";
+    break;
+  case LANG_CVC4:
+    out << "LANG_CVC4";
+    break;
+  case LANG_AUTO:
+    out << "LANG_AUTO";
+    break;
+  default:
+    out << "undefined_input_language";
+  }
+  return out;
+}
+
+}/* CVC4::language::input namespace */
+
+namespace output {
+
+enum Language {
+  // SPECIAL "NON-LANGUAGE" LANGUAGES HAVE ENUM VALUE < 0
+
+  // COMMON INPUT AND OUTPUT LANGUAGES HAVE ENUM VALUES IN [0,999]
+  // AND SHOULD CORRESPOND IN PLACEMENT WITH INPUTLANGUAGE
+  //
+  // EVEN IF A LANGUAGE ISN'T CURRENTLY SUPPORTED AS AN INPUT OR
+  // OUTPUT LANGUAGE, IF IT IS "IN PRINCIPLE" A COMMON LANGUAGE,
+  // INCLUDE IT HERE
+
+  /** The SMTLIB output language */
+  LANG_SMTLIB = input::LANG_SMTLIB,
+  /** The SMTLIB v2 output language */
+  LANG_SMTLIB_V2 = input::LANG_SMTLIB_V2,
+  /** The CVC4 output language */
+  LANG_CVC4 = input::LANG_CVC4,
+
+  // START OUTPUT-ONLY LANGUAGES AT ENUM VALUE 1000
+  // THESE ARE IN PRINCIPLE NOT POSSIBLE INPUT LANGUAGES
+
+  /** The AST output language */
+  LANG_AST = 1000
+
+};/* enum Language */
+
+inline std::ostream& operator<<(std::ostream& out, Language lang) {
+  switch(lang) {
+  case LANG_SMTLIB:
+    out << "LANG_SMTLIB";
+    break;
+  case LANG_SMTLIB_V2:
+    out << "LANG_SMTLIB_V2";
+    break;
+  case LANG_CVC4:
+    out << "LANG_CVC4";
+    break;
+  case LANG_AST:
+    out << "LANG_AUTO";
+    break;
+  default:
+    out << "undefined_output_language";
+  }
+  return out;
+}
+
+}/* CVC4::language::output namespace */
+
+}/* CVC4::language namespace */
+
+typedef language::input::Language InputLanguage;
+typedef language::output::Language OutputLanguage;
+
+namespace language {
+
+inline OutputLanguage toOutputLanguage(InputLanguage language) {
+  switch(language) {
+  case input::LANG_SMTLIB:
+  case input::LANG_SMTLIB_V2:
+  case input::LANG_CVC4:
+    // these entries correspond
+    return OutputLanguage(int(language));
+
+  default: {
+    std::stringstream ss;
+    ss << "Cannot map input language `" << language
+       << "' to an output language.";
+    throw CVC4::Exception(ss.str());
+  }
+  }/* switch(language) */
+}/* toOutputLanguage() */
+
+}/* CVC4::language namespace */
+}/* CVC4 namespace */
+
+#endif /* __CVC4__LANGUAGE_H */