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diff --git a/srcjar/fr/orsay/lri/varna/models/treealign/RNANodeValue2.java b/srcjar/fr/orsay/lri/varna/models/treealign/RNANodeValue2.java
new file mode 100644
index 0000000..6fff9a9
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+++ b/srcjar/fr/orsay/lri/varna/models/treealign/RNANodeValue2.java
@@ -0,0 +1,136 @@
+package fr.orsay.lri.varna.models.treealign;
+import java.util.ArrayList;
+import java.util.List;
+
+
+
+/**
+ * In this model, nodes are either:
+ * 1. a couple of paired bases, and in that case they may have children,
+ *    in this case singleNode is true 
+ * 2. a single base that comes from a broken base pair
+ *    (broken during planarization), without children,
+ *    in this case singleNode is true
+ * 3. a list of consecutive non-paired bases, without children.
+ *    in this case singleNode is false
+ * Note that case 2 happens only if original sequences contained
+ * pseudoknots, otherwise this case can be ignored.
+ * 
+ * @author Raphael Champeimont
+ *
+ */
+public class RNANodeValue2 implements GraphvizDrawableNodeValue {
+	/**
+	 * Says whether we have a single node or a list of nodes.
+	 */
+	private boolean singleNode = true;
+	
+	/**
+	 * Defined if singleNode is true. 
+	 */
+	private RNANodeValue node;
+	
+	/**
+	 * Defined if singleNode is false; 
+	 */
+	private List<RNANodeValue> nodes;
+	
+	public RNANodeValue2(boolean singleNode) {
+		this.singleNode = singleNode;
+		if (singleNode) {
+			node = new RNANodeValue();
+		} else {
+			nodes = new ArrayList<RNANodeValue>();
+		}
+	}
+
+	/**
+	 * In case of a single node, return it.
+	 * Will throw RNANodeValue2WrongTypeException if singleNode = false.
+	 */
+	public RNANodeValue getNode() {
+		if (singleNode) {
+			return node;
+		} else {
+			throw (new RNANodeValue2WrongTypeException());
+		}
+	}
+	
+	public void setNode(RNANodeValue node) {
+		if (singleNode) {
+			this.node = node;
+		} else {
+			throw (new RNANodeValue2WrongTypeException());
+		}
+	}
+
+	/**
+	 * In case of multiple nodes, return them.
+	 * Will throw RNANodeValue2WrongTypeException if singleNode = true.
+	 */
+	public List<RNANodeValue> getNodes() {
+		if (!singleNode) {
+			return nodes;
+		} else {
+			throw (new RNANodeValue2WrongTypeException());
+		}
+	}
+	/**
+	 * In case of multiple nodes, return the sequence of nucleotides.
+	 */
+	public char[] computeSequence() {
+		if (!singleNode) {
+			final int n = nodes.size();
+			char[] sequence = new char[n];
+			for (int i=0; i<n; i++) {
+				sequence[i] = nodes.get(i).getLeftNucleotide().charAt(0);
+			}
+			return sequence;
+		} else {
+			throw (new RNANodeValue2WrongTypeException());
+		}
+	}
+	
+	public void setNodes(List<RNANodeValue> nodes) {
+		if (!singleNode) {
+			this.nodes = nodes;
+		} else {
+			throw (new RNANodeValue2WrongTypeException());
+		}
+	}
+
+	public boolean isSingleNode() {
+		return singleNode;
+	}
+	
+	public String toString() {
+		if (singleNode) {
+			return node.toString();
+		} else {
+			String s = "";
+			for (RNANodeValue node: nodes) {
+				if (s != "") {
+					s += " ";
+				}
+				s += node.toString();
+			}
+			return s;
+		}
+	}
+	
+	public String toGraphvizNodeName() {
+		if (singleNode) {
+			return node.toGraphvizNodeName();
+		} else {
+			String s = "";
+			for (RNANodeValue node: nodes) {
+				if (s != "") {
+					s += " ";
+				}
+				s += node.toGraphvizNodeName();
+			}
+			return s;
+		}
+	}
+
+}