--- /dev/null
+package fr.orsay.lri.varna.models.treealign;
+
+/**
+ * Same as TreeAlignLabelDistanceAsymmetric, but elements on both
+ * trees are of the same type, and the function is symmetric, ie.
+ * f(x,y) = f(y,x) .
+ *
+ * @param <ValueType>
+ */
+public interface TreeAlignLabelDistanceSymmetric<ValueType> extends TreeAlignLabelDistanceAsymmetric<ValueType, ValueType> {
+
+}