<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>XHTML Document</title>
</head>
<body>
    <div class="page-wrapper">
        <header></header>
        <nav>
            <ul>
                <li><a href="#">Home</a></li>
                <li><a href="#">Services</a></li>
                <li><a href="#">About</a></li>
                <li><a href="#">Contact</a></li>
            </ul>
        </nav>
        <main>
            <aside></aside>
            <section>
                <article>
                    <div class="grid-item">
                        <div class="module">
                            <div class="hd"></div>
                            <div class="bd"></div>
                            <div class="ft"></div>
                        </div>
                    </div>
                    <div class="grid-item">
                        <div class="module">
                            <div class="hd"></div>
                            <div class="bd"></div>
                            <div class="ft"></div>
                        </div>
                    </div>
                    <div class="grid-item">
                        <div class="module">
                            <div class="hd"></div>
                            <div class="bd"></div>
                            <div class="ft"></div>
                        </div>
                    </div>
                </article>
            </section>
            <aside></aside>
        </main>
        <footer></footer>
    </div>
</body>
</html>