```js
// YourPage.js|jsx|ts|tsx

import React, { useState, useEffect } from 'react';

import { PageLayout } from './PageLayout';
import { DocumentHeader } from './DocumentHeader';
import { DocumentList } from './DocumentList';

// Example hook to retrieve data from an external endpoint
function useFetchData() {
  const [status, setStatus] = useState('idle');
  const [data, setData] = useState([]);
  useEffect(() => {
    setStatus('loading');
    fetch('https://your-restful-endpoint')
      .then((res) => {
        if (!res.ok) {
          throw new Error(res.statusText);
        }
        return res;
      })
      .then((res) => res.json())
      .then((data) => {
        setStatus('success');
        setData(data);
      })
      .catch(() => {
        setStatus('error');
      });
  }, []);
  return {
    status,
    data,
  };
}
export function DocumentScreen() {
  const { status, data } = useFetchData();

  const { user, document, subdocuments } = data;

  if (status === 'loading') {
    return <p>Loading...</p>;
  }
  if (status === 'error') {
    return <p>There was an error fetching the data!</p>;
  }
  return (
    <PageLayout user={user}>
      <DocumentHeader document={document} />
      <DocumentList documents={subdocuments} />
    </PageLayout>
  );
}
```