diff --git a/packages/core/src/storage/FreLionwebSerializer.ts b/packages/core/src/storage/FreLionwebSerializer.ts
index 105ec6c2d..1a7d7e80b 100644
--- a/packages/core/src/storage/FreLionwebSerializer.ts
+++ b/packages/core/src/storage/FreLionwebSerializer.ts
@@ -3,7 +3,7 @@ import { FreLanguage, FreLanguageProperty } from "../language";
 import { FreLogger } from "../logging/index";
 import { FreUtils, isNullOrUndefined, jsonAsString } from "../util";
 import { FreSerializer } from "./FreSerializer";
-import { createLwNode, isLwChunk, LwChild, LwChunk, LwMetaPointer, LwNode, LwReference } from "./LionwebM3";
+import { createLwNode, isLwChunk, LwContainment, LwChunk, LwMetaPointer, LwNode, LwReference } from "./LionwebM3";
 
 const LOGGER = new FreLogger("FreLionwebSerializer");
 /**
@@ -209,7 +209,7 @@ export class FreLionwebSerializer implements FreSerializer {
     }
 
     private convertChildProperties(freNode: FreNode, concept: string, jsonObject: LwNode): ParsedChild[] {
-        const jsonChildren = jsonObject.children;
+        const jsonChildren = jsonObject.containments;
         FreUtils.CHECK(Array.isArray(jsonChildren), "Found children value which is not a Array for node: " + jsonObject.id);
         const parsedChildren: ParsedChild[] = [];
         for (const jsonChild of Object.values(jsonChildren)) {
@@ -372,7 +372,7 @@ export class FreLionwebSerializer implements FreSerializer {
                     LOGGER.log("PART is null: " + + parentNode["name"] + "." + p.name);
                     break;
                 }
-                const child: LwChild = {
+                const child: LwContainment = {
                     containment: this.createMetaPointer(p.key, p.language),
                     children: []
                 };
@@ -385,7 +385,7 @@ export class FreLionwebSerializer implements FreSerializer {
                     // single value
                     child.children.push((!!value ? this.convertToJSONinternal(value as FreNode, publicOnly, idMap) : null).id);
                 }
-                result.children.push(child);
+                result.containments.push(child);
                 break;
             case "reference":
                 const lwReference: LwReference = {
diff --git a/packages/core/src/storage/LionwebM3.ts b/packages/core/src/storage/LionwebM3.ts
index 939b6b0a3..2ea738838 100644
--- a/packages/core/src/storage/LionwebM3.ts
+++ b/packages/core/src/storage/LionwebM3.ts
@@ -46,7 +46,7 @@ export type LwNode = {
     id: Id;
     classifier: LwMetaPointer;
     properties: LwProperty[];
-    children: LwChild[];
+    containments: LwContainment[];
     references: LwReference[];
     parent: string;
 }
@@ -56,7 +56,7 @@ export function isLwNode(box: any): box is LwNode {
     return lwNode.id !== undefined &&
         lwNode.classifier !== undefined &&
         lwNode.properties !== undefined &&
-        lwNode.children !== undefined &&
+        lwNode.containments !== undefined &&
         lwNode.references !== undefined &&
         lwNode.parent !== undefined;
 }
@@ -66,7 +66,7 @@ export function createLwNode(): LwNode {
         id: null,
         classifier: null,
         properties: [],
-        children: [],
+        containments: [],
         references: [],
         parent: null
     }
@@ -83,13 +83,13 @@ export function isLwProperty(obj: any): obj is LwProperty {
         lwProperty.value !== undefined;
 }
 
-export type LwChild = {
+export type LwContainment = {
     containment: LwMetaPointer;
     children: string[];
 }
 
-export function isLwChild(obj: any): obj is LwChild {
-    const lwChild = obj as LwChild;
+export function isLwChild(obj: any): obj is LwContainment {
+    const lwChild = obj as LwContainment;
     return lwChild.containment !== undefined &&
         lwChild.children !== undefined;
 }