Oops, missed Identifiable interface!
diff --git a/api/src/main/java/brooklyn/entity/trait/Identifiable.java b/api/src/main/java/brooklyn/entity/trait/Identifiable.java
new file mode 100644
index 0000000..5d3b859
--- /dev/null
+++ b/api/src/main/java/brooklyn/entity/trait/Identifiable.java
@@ -0,0 +1,6 @@
+package brooklyn.entity.trait;
+
+public interface Identifiable {
+
+    String getId();
+}