diff --git a/li.strolch.agent/src/main/java/li/strolch/search/SearchExpressions.java b/li.strolch.agent/src/main/java/li/strolch/search/SearchExpressions.java
index 326a14483..c875bf537 100644
--- a/li.strolch.agent/src/main/java/li/strolch/search/SearchExpressions.java
+++ b/li.strolch.agent/src/main/java/li/strolch/search/SearchExpressions.java
@@ -1,6 +1,7 @@
 package li.strolch.search;
 
 import static li.strolch.model.StrolchModelConstants.BAG_PARAMETERS;
+import static li.strolch.model.StrolchModelConstants.BAG_RELATIONS;
 
 import java.util.function.Supplier;
 
@@ -56,6 +57,10 @@ public interface SearchExpressions {
 		return ExpressionsSupport.param(BAG_PARAMETERS, paramId);
 	}
 
+	default ExpressionBuilder relation(String paramId) {
+		return ExpressionsSupport.param(BAG_RELATIONS, paramId);
+	}
+
 	default ExpressionBuilder param(String bagId, String paramId) {
 		return ExpressionsSupport.param(bagId, paramId);
 	}