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diff --git a/fuzzylite/fl/rule/Expression.h b/fuzzylite/fl/rule/Expression.h
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+/*
+ Author: Juan Rada-Vilela, Ph.D.
+ Copyright (C) 2010-2014 FuzzyLite Limited
+ All rights reserved
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the GNU Lesser General Public License as published by the Free
+ Software Foundation, either version 3 of the License, or (at your option)
+ any later version.
+
+ fuzzylite is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with fuzzylite.  If not, see <http://www.gnu.org/licenses/>.
+
+ fuzzylite™ is a trademark of FuzzyLite Limited.
+
+ */
+
+#ifndef FL_EXPRESSION_H
+#define FL_EXPRESSION_H
+
+#include "fl/fuzzylite.h"
+
+#include <string>
+#include <vector>
+
+
+
+namespace fl {
+    class Variable;
+    class Hedge;
+    class Term;
+
+    class FL_API Expression {
+    public:
+
+        Expression();
+        virtual ~Expression();
+
+        virtual std::string toString() const = 0;
+
+    private:
+        FL_DISABLE_COPY(Expression)
+    };
+
+    class FL_API Proposition : public Expression {
+    public:
+        Variable* variable;
+        std::vector<Hedge*> hedges;
+        Term* term;
+
+        Proposition();
+        virtual ~Proposition() FL_IOVERRIDE;
+
+        virtual std::string toString() const FL_IOVERRIDE;
+
+    private:
+        FL_DISABLE_COPY(Proposition)
+    };
+
+    class FL_API Operator : public Expression {
+    public:
+        std::string name;
+        Expression* left;
+        Expression* right;
+
+        Operator();
+        virtual ~Operator() FL_IOVERRIDE;
+
+        virtual std::string toString() const FL_IOVERRIDE;
+
+    private:
+        FL_DISABLE_COPY(Operator)
+
+    };
+
+}
+#endif /* FL_FUZZYEXPRESSION_H */