--- /dev/null
+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();
+}