diff --git a/li.strolch.model/src/main/java/li/strolch/model/json/ActivityToFlatJsonVisitor.java b/li.strolch.model/src/main/java/li/strolch/model/json/ActivityToFlatJsonVisitor.java
index 5dddbef95..c0f91d2f0 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/json/ActivityToFlatJsonVisitor.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/json/ActivityToFlatJsonVisitor.java
@@ -1,5 +1,7 @@
 package li.strolch.model.json;
 
+import java.util.function.BiConsumer;
+
 import com.google.gson.JsonObject;
 
 import li.strolch.model.activity.Activity;
@@ -11,4 +13,28 @@ public class ActivityToFlatJsonVisitor extends ToFlatJsonVisitor<Activity> imple
 	public JsonObject visit(Activity element) {
 		return toJson(element);
 	}
+
+	@Override
+	public ActivityToFlatJsonVisitor withoutElementName() {
+		super.withoutElementName();
+		return this;
+	}
+
+	@Override
+	public ActivityToFlatJsonVisitor setHook(BiConsumer<Activity, JsonObject> hook) {
+		super.setHook(hook);
+		return this;
+	}
+
+	@Override
+	public ActivityToFlatJsonVisitor ignoreBag(String bagId) {
+		super.ignoreBag(bagId);
+		return this;
+	}
+
+	@Override
+	public ActivityToFlatJsonVisitor ignoreParameter(String bagId, String paramId) {
+		super.ignoreParameter(bagId, paramId);
+		return this;
+	}
 }
diff --git a/li.strolch.model/src/main/java/li/strolch/model/json/OrderToFlatJsonVisitor.java b/li.strolch.model/src/main/java/li/strolch/model/json/OrderToFlatJsonVisitor.java
index 1ba93ebaf..323dde106 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/json/OrderToFlatJsonVisitor.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/json/OrderToFlatJsonVisitor.java
@@ -1,5 +1,7 @@
 package li.strolch.model.json;
 
+import java.util.function.BiConsumer;
+
 import com.google.gson.JsonObject;
 
 import li.strolch.model.Order;
@@ -11,4 +13,28 @@ public class OrderToFlatJsonVisitor extends ToFlatJsonVisitor<Order> implements
 	public JsonObject visit(Order element) {
 		return toJson(element);
 	}
+
+	@Override
+	public OrderToFlatJsonVisitor withoutElementName() {
+		super.withoutElementName();
+		return this;
+	}
+
+	@Override
+	public OrderToFlatJsonVisitor setHook(BiConsumer<Order, JsonObject> hook) {
+		super.setHook(hook);
+		return this;
+	}
+
+	@Override
+	public OrderToFlatJsonVisitor ignoreBag(String bagId) {
+		super.ignoreBag(bagId);
+		return this;
+	}
+
+	@Override
+	public OrderToFlatJsonVisitor ignoreParameter(String bagId, String paramId) {
+		super.ignoreParameter(bagId, paramId);
+		return this;
+	}
 }
diff --git a/li.strolch.model/src/main/java/li/strolch/model/json/ResourceToFlatJsonVisitor.java b/li.strolch.model/src/main/java/li/strolch/model/json/ResourceToFlatJsonVisitor.java
index ed441bd7f..bb693e615 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/json/ResourceToFlatJsonVisitor.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/json/ResourceToFlatJsonVisitor.java
@@ -1,5 +1,7 @@
 package li.strolch.model.json;
 
+import java.util.function.BiConsumer;
+
 import com.google.gson.JsonObject;
 
 import li.strolch.model.Resource;
@@ -11,4 +13,28 @@ public class ResourceToFlatJsonVisitor extends ToFlatJsonVisitor<Resource> imple
 	public JsonObject visit(Resource element) {
 		return toJson(element);
 	}
+
+	@Override
+	public ResourceToFlatJsonVisitor withoutElementName() {
+		super.withoutElementName();
+		return this;
+	}
+
+	@Override
+	public ResourceToFlatJsonVisitor setHook(BiConsumer<Resource, JsonObject> hook) {
+		super.setHook(hook);
+		return this;
+	}
+
+	@Override
+	public ResourceToFlatJsonVisitor ignoreBag(String bagId) {
+		super.ignoreBag(bagId);
+		return this;
+	}
+
+	@Override
+	public ResourceToFlatJsonVisitor ignoreParameter(String bagId, String paramId) {
+		super.ignoreParameter(bagId, paramId);
+		return this;
+	}
 }
diff --git a/li.strolch.model/src/main/java/li/strolch/model/json/ToFlatJsonVisitor.java b/li.strolch.model/src/main/java/li/strolch/model/json/ToFlatJsonVisitor.java
index e7965d8ca..802c16510 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/json/ToFlatJsonVisitor.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/json/ToFlatJsonVisitor.java
@@ -45,6 +45,7 @@ public class ToFlatJsonVisitor<T extends StrolchRootElement> {
 
 	private MapOfSets<String, String> ignoredKeys;
 	private BiConsumer<T, JsonObject> hook;
+	private boolean withoutElementName;
 
 	public ToFlatJsonVisitor() {
 		this.ignoredKeys = new MapOfSets<>();
@@ -54,16 +55,24 @@ public class ToFlatJsonVisitor<T extends StrolchRootElement> {
 		this.ignoredKeys = new MapOfSets<>();
 	}
 
-	public void setHook(BiConsumer<T, JsonObject> hook) {
+	public ToFlatJsonVisitor<T> withoutElementName() {
+		this.withoutElementName = true;
+		return this;
+	}
+
+	public ToFlatJsonVisitor<T> setHook(BiConsumer<T, JsonObject> hook) {
 		this.hook = hook;
+		return this;
 	}
 
-	public void ignoreBag(String bagId) {
+	public ToFlatJsonVisitor<T> ignoreBag(String bagId) {
 		this.ignoredKeys.addSet(bagId, Collections.emptySet());
+		return this;
 	}
 
-	public void ignoreParameter(String bagId, String paramId) {
+	public ToFlatJsonVisitor<T> ignoreParameter(String bagId, String paramId) {
 		this.ignoredKeys.addElement(bagId, paramId);
+		return this;
 	}
 
 	public JsonObject toJson(T element) {
@@ -71,7 +80,8 @@ public class ToFlatJsonVisitor<T extends StrolchRootElement> {
 		JsonObject jsonObject = new JsonObject();
 
 		jsonObject.addProperty(ID, element.getId());
-		jsonObject.addProperty(NAME, element.getName());
+		if (!this.withoutElementName)
+			jsonObject.addProperty(NAME, element.getName());
 		jsonObject.addProperty(TYPE, element.getType());
 		jsonObject.addProperty(OBJECT_TYPE, element.getClass().getSimpleName());
 
@@ -93,7 +103,8 @@ public class ToFlatJsonVisitor<T extends StrolchRootElement> {
 					continue;
 
 				if (jsonObject.has(paramId)) {
-					throw new StrolchModelException("JsonObject already has a member with ID " + paramId);
+					throw new StrolchModelException(
+							"JsonObject already has a member with ID " + paramId + ": " + parameterBag.getLocator());
 				}
 
 				Parameter<?> param = parameterBag.getParameter(paramId);