<form method="post" name="demo">
    First name:<br />
    <input type="text" name="firstname" mapping="firstname" required /><br />

    Age:<br />
    <input type="int" value="" name="age" mapping="age" required /><br />

    E-mail :<br />
    <input type="email" name="email" mapping="email" prettyname="e-mail address" /><br />

    Gender:<br />
    <label><input type="radio" name="gender" value="m" required mapping="gender" /> Homme</label><br />
    <label><input type="radio" name="gender" value="f" /