diff --git a/li.strolch.xmlpers/src/main/java/li/strolch/xmlpers/objref/ObjectRef.java b/li.strolch.xmlpers/src/main/java/li/strolch/xmlpers/objref/ObjectRef.java
index 227f61d48..b558d7c1a 100644
--- a/li.strolch.xmlpers/src/main/java/li/strolch/xmlpers/objref/ObjectRef.java
+++ b/li.strolch.xmlpers/src/main/java/li/strolch/xmlpers/objref/ObjectRef.java
@@ -22,7 +22,7 @@ import li.strolch.xmlpers.api.PersistenceContext;
 import li.strolch.xmlpers.api.PersistenceTransaction;
 import li.strolch.xmlpers.impl.PathBuilder;
 
-public abstract class ObjectRef extends LockableObject {
+public abstract class ObjectRef extends LockableObject implements Comparable<ObjectRef> {
 
 	protected final String name;
 
@@ -71,4 +71,9 @@ public abstract class ObjectRef extends LockableObject {
 	public int hashCode() {
 		return Objects.hash(this.name);
 	}
+
+	@Override
+	public int compareTo(ObjectRef o) {
+		return this.name.compareTo(o.name);
+	}
 }