contiago-toolbar/app/components/ArticleLayoutBig/messages.js

One of the options for outputting content from contiago xml-server

import { defineMessages } from 'react-intl';

export default defineMessages({
  header: {
    id: 'app.components.ArticleLayoutBig.header',
    defaultMessage: 'This is the ArticleLayoutBig component !',
  },
});