diff --git a/prism/src/explicit/ModelExpressionTransformationNested.java b/prism/src/explicit/ModelExpressionTransformationNested.java
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+//==============================================================================
+//	
+//	Copyright (c) 2015-
+//	Authors:
+//	* Joachim Klein <klein@tcs.inf.tu-dresden.de> (TU Dresden)
+//	
+//------------------------------------------------------------------------------
+//	
+//	This file is part of PRISM.
+//	
+//	PRISM 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 2 of the License, or
+//	(at your option) any later version.
+//	
+//	PRISM 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 PRISM; if not, write to the Free Software Foundation,
+//	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//	
+//==============================================================================
+
+package explicit;
+
+import parser.ast.Expression;
+import prism.PrismException;
+
+
+/**
+ * Combines two (compatible) ModelExpressionTransformation.
+ * <br>
+ * The inner transformation is applied first, with the result
+ * serving as the input for the second, outer transformation.
+ *
+ * @param <OriginalModel> The input type for the inner transformation
+ * @param <IntermediateModel> The output type for the inner and the input type for the outer transformation
+ * @param <TransformedModel> The output type for the outer transformation
+ */
+public class ModelExpressionTransformationNested<OriginalModel extends Model,
+                                                 IntermediateModel extends Model,
+                                                 TransformedModel extends Model>
+	extends ModelTransformationNested<OriginalModel, IntermediateModel, TransformedModel>
+	implements ModelExpressionTransformation<OriginalModel, TransformedModel> {
+
+	/**
+	 * Constructor.
+	 * <br>
+	 * The output (transformed) model of the inner transformation
+	 * has to be the input (original) model of the outer transformation.
+	 *
+	 * @param innerTransformation the inner transformation
+	 * @param outerTransformation the outer transformation
+	 */
+	public ModelExpressionTransformationNested(ModelExpressionTransformation<OriginalModel, ? extends IntermediateModel> innerTransformation,
+	                                           ModelExpressionTransformation<? extends IntermediateModel, TransformedModel> outerTransformation)
+	{
+		super(innerTransformation, outerTransformation);
+	}
+
+	@Override
+	public Expression getTransformedExpression() {
+		// the transformed expression for the nested transformation
+		// is the transformed expression for the outer transformation
+		return ((ModelExpressionTransformation<?,?>) outerTransformation).getTransformedExpression();
+	}
+
+	@Override
+	public Expression getOriginalExpression() {
+		// the original expression for the nested transformation
+		// is the original expression for the inner transformation
+		return ((ModelExpressionTransformation<?,?>) innerTransformation).getTransformedExpression();
+	}
+}