keep container id

editors/demo/src/OEN/config/config.js

@@ -143,7 +143,7 @@ export default {
         },
         {
           displayName: 'outline',
-          headingLevel: 3,
+          headingLevel: 2,
           isSection: false,
           nestedHeadingLevel: 4,
           className: 'outline',

wax-prosemirror-services/src/OENContainersService/schema/OenContainerNode.js

@@ -2,6 +2,7 @@ const OenContainerNode = {
   content: 'block+',
   group: 'block',
   attrs: {
+    id: { default: '' },
     class: { default: '' },
     type: { default: 'content_structure_element' },
   },
@@ -11,6 +12,7 @@ const OenContainerNode = {
       tag: 'div[data-type="content_structure_element"]',
       getAttrs(dom) {
         return {
+          id: dom.getAttribute('id'),
           class: dom.getAttribute('class'),
           type: dom.dataset.type,
         };
@@ -21,6 +23,7 @@ const OenContainerNode = {
     return [
       'div',
       {
+        id: node.attrs.id,
         class: node.attrs.class,
         'data-type': node.attrs.type,
       },