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diff --git a/src/model/domain/ClassReferenceSet.hpp b/src/model/domain/ClassReferenceSet.hpp
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+/*
+    Ousía
+    Copyright (C) 2014  Benjamin Paaßen, Andreas Stöckel
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _OUSIA_MODEL_DOMAIN_CLASSREFERENCESET_HPP_
+#define _OUSIA_MODEL_DOMAIN_CLASSREFERENCESET_HPP_
+
+#include "ClassReference.hpp"
+#include <model/RangeSet.hpp>
+
+namespace ousia {
+namespace model {
+namespace domain {
+
+/**
+ * A ClassReferenceSet lazily defines references to classes that are allowed at
+ * this point of the domain description. It specifies a set in a twofold meaning:
+ * 1.) It defines the set of classes, that are allowed.
+ * 2.) It defines how many instances of those classes have to be instantiated
+ *		in a document that implements this domain standard (cardinality).
+ */
+class ClassReferenceSet {
+
+private:
+	std::vector<std::shared_ptr<ClassReference>> conjunctions;
+	std::shared_ptr<RangeSet<unsigned int>> cardinality;
+
+public:
+
+	/**
+	 * This defines the conjunctions of references to classes that are allowed
+	 * Please note that each ClassReference again does not have to reference to
+	 * a single class but can also reference to multiple classes in a *
+	 * expression.
+	 */
+	std::vector<std::shared_ptr<ClassReference>>& getConjunctions()
+	{
+		return conjunctions;
+	}
+
+	std::shared_ptr<RangeSet<unsigned int>> getCardinality()
+	{
+		return cardinality;
+	}
+
+	void setCardinality(std::shared_ptr<RangeSet<unsigned int>>)
+	{
+		this->cardinality = cardinality;
+	}
+
+};
+
+}
+}
+}
+
+#endif /* _OUSIA_MODEL_DOMAIN_CLASSREFERENCESET_HPP_ */
+