docs: @Override
      protected Element exportDataElement(String userName) {
          final Integer userId = this.userIdentityStore.getPortalUserId(userName);
          if (userId == null) {
              this.logger.warn("No user " + userName + " found, no layout will be exported");
              return null;
          }
  
          // Setup empty IPerson used to interact with the layout store
          final PersonImpl person = new PersonImpl();
          person.setUserName(userName);
          person.setID(userId);
          person.setSecurityContext(new BrokenSecurityContext());
  
          try {
              this.userLayoutStore.setProfileImportExportCache(layoutCache);
              this.userLayoutStore.setLayoutImportExportCache(profileCache);
  
              final IUserProfile userProfile =
                      userLayoutStore.getUserProfileByFname(
                              person, UserProfile.DEFAULT_PROFILE_FNAME);
              final Element layoutElement = userLayoutStore.exportLayout(person, userProfile);
  
              return layoutElement;
          } finally {
              this.userLayoutStore.setProfileImportExportCache(null);
              this.userLayoutStore.setLayoutImportExportCache(null);
          }
      }