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diff --git a/src/include/open-axiom/SyntaxTree b/src/include/open-axiom/SyntaxTree
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+// -*- C++ -*-
+// Copyright (C) 2017, Gabriel Dos Reis.
+// All rights reserved.
+// Written by Gabriel Dos Reis.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     - Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//
+//     - Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in
+//       the documentation and/or other materials provided with the
+//       distribution.
+//
+//     - Neither the name of OpenAxiom, nor the names of its contributors may
+//       be used to endorse or promote products derived from this software
+//       without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef OPENAXIOM_SYNTAX_TREE_included
+#define OPENAXIOM_SYNTAX_TREE_included
+
+#include <stdint.h>
+#include <open-axiom/token>
+
+namespace OpenAxiom {
+   enum class SyntaxKind : uint8_t {
+      Module, Namespce, Import, Definition, Unparsed
+   };
+   
+   enum SyntaxTree : uint32_t { };
+
+   constexpr SyntaxKind kind(SyntaxTree t) {
+      return SyntaxKind((uint32_t(t) & 0xFF000000) >> 24);
+   }
+
+   constexpr uint32_t index(SyntaxTree t) {
+      return uint32_t(t) & 0x00FFFFFF;
+   }
+
+   struct ModuleSyntax {
+      TokenIndex keyword;
+      TokenIndex name;
+   };
+
+   struct NamespaceSyntax {
+      TokenIndex keyword;
+      TokenIndex name;
+   };
+
+   struct ImportSyntax {
+      TokenIndex keyword;
+   };
+
+   struct DefinitionSyntax {
+      TokenIndex keyword;
+   };
+
+   struct UnparsedSyntax {
+      TokenIndex first;
+      TokenIndex last;
+   };
+}
+
+#endif  // OPENAXIOM_SYNTAX_TREE_included
+