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diff --git a/srcjar/fr/orsay/lri/varna/models/treealign/GraphvizDrawableNodeValue.java b/srcjar/fr/orsay/lri/varna/models/treealign/GraphvizDrawableNodeValue.java
new file mode 100644
index 0000000..46c50ec
--- /dev/null
+++ b/srcjar/fr/orsay/lri/varna/models/treealign/GraphvizDrawableNodeValue.java
@@ -0,0 +1,14 @@
+package fr.orsay.lri.varna.models.treealign;
+
+/**
+ * A tree can be displayed using graphviz (using class TreeGraphviz)
+ * if the node values in the tree implement this interface.
+ * 
+ * @author Raphael Champeimont
+ */
+public interface GraphvizDrawableNodeValue {
+	/**
+	 * Returns a string that will be displayed on the node by graphviz.
+	 */
+	public String toGraphvizNodeName();
+}