```html
<!-- YourPage.vue -->

<template>
  <div v-if="loading">Loading...</div>

  <div v-else-if="error">There was an error fetching the data!</div>

  <div v-if="!loading && data && result.subdocuments.length">
    <PageLayout :user="data.user">
      <DocumentHeader :document="result.document" />
      <DocumentList :documents="result.subdocuments" />
    </PageLayout>
  </div>
</template>

<script>
  import PageLayout from './PageLayout';
  import DocumentHeader from './DocumentHeader';
  import DocumentList from './DocumentList';

  import gql from 'graphql-tag';
  import { useQuery } from '@vue/apollo-composable';

  export default {
    name: 'DocumentScreen',
    setup() {
      const { result, loading, error } = useQuery(gql`
        query AllInfoQuery {
          user {
            userID
            name
          }
          document {
            id
            userID
            title
            brief
            status
          }
          subdocuments {
            id
            userID
            title
            content
            status
          }
        }
      `);
      return {
        result,
        loading,
        error,
      };
    },
  };
</script>
```