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diff --git a/srcjar/fr/orsay/lri/varna/models/treealign/AlignedNode.java b/srcjar/fr/orsay/lri/varna/models/treealign/AlignedNode.java
new file mode 100644
index 0000000..9f42890
--- /dev/null
+++ b/srcjar/fr/orsay/lri/varna/models/treealign/AlignedNode.java
@@ -0,0 +1,48 @@
+package fr.orsay.lri.varna.models.treealign;
+
+
+/**
+ * The type of node values in an alignment.
+ * Contains a reference to both original nodes.
+ * This class implements GraphvizDrawableNodeValue but it will only work
+ * if the original nodes implement it.
+ * @author Raphael Champeimont
+ * @param <OriginalNodeValueType1> The type of values in the original first tree.
+ * @param <OriginalNodeValueType2> The type of values in the original second tree.
+ */
+public class AlignedNode<OriginalNodeValueType1, OriginalNodeValueType2> implements GraphvizDrawableNodeValue {
+	private Tree<OriginalNodeValueType1> leftNode;
+	private Tree<OriginalNodeValueType2> rightNode;
+
+	public Tree<OriginalNodeValueType1> getLeftNode() {
+		return leftNode;
+	}
+
+	public void setLeftNode(Tree<OriginalNodeValueType1> leftNode) {
+		this.leftNode = leftNode;
+	}
+
+	public Tree<OriginalNodeValueType2> getRightNode() {
+		return rightNode;
+	}
+
+	public void setRightNode(Tree<OriginalNodeValueType2> rightNode) {
+		this.rightNode = rightNode;
+	}
+	
+	private String maybeNodeToGraphvizNodeName(Tree <? extends GraphvizDrawableNodeValue> tree) {
+		return (tree != null && tree.getValue() != null) ? tree.getValue().toGraphvizNodeName() : "_";
+	}
+
+	/**
+	 * This method will work only if the left and right node
+	 * already implement GraphvizDrawableNodeValue.
+	 */
+	@SuppressWarnings("unchecked")
+	public String toGraphvizNodeName() {
+		return "(" + maybeNodeToGraphvizNodeName((Tree) leftNode)
+		+ "," + maybeNodeToGraphvizNodeName((Tree) rightNode) + ")";
+	}
+
+
+}