不能确定这段代码在Framework 上怎么工作

不能确定这段代码在Framework 上如何工作
多谢诸位。

新到公司， 在Framework MVC 上看到如下代码，看不大懂是不是php，是如何工作的，请教一下。


page.header.html

nbsp;html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br>
<br>
<br>
    <title>{C::$DOMAIN} - {$config.title}</title><br>
    <link><br>
    <script></script><br>
    <meta><br>
<br>
<br>
    {if ($debug)}<br>
    <div>
<br>
        <div>
<br>
            <a>SQL ({count($sql_log)})</a><br>
            <a>DUMP ({count($dump)})</a><br>
            <a>Profile ({$profile.time})</a><br>
        </div>
<br>
        <div>
<br>
            Time: {$profile.time} sec.<br><br>
            Memory: {$profile.memory} bytes<br>
        </div>
<br>
        {foreach name=dump from=$dump item=item}<br>
            <div>Dump: {$item.file}:{$item.line}<br>{$item.dump|nl2br}</div>
<br>
        {/foreach}<br>
        {foreach name=sql_log from=$sql_log item=item}<br>
            <div>Time {$item.time}, {$item.records} records: <br> {$item.query|nl2br}{if ($item.data)} <br><br>{var_dump($item.data)|escape}{/if}</div>
<br>
        {/foreach}<br>
    </div><br>
    {/if}<br>
    <div><h1>XYZ - {$config.title}</h1></div><br>
    <div>
<br>
        <div>
<br>
            <a></a><br>
            <a></a><div></div>
<br>
            {if ($user->logged())}<br>
            <iframe></iframe><br>
            <div>
<br>
                <ul>
<br>
                    <li>
<br>
                        <a>Home</a><br>
                    </li>
<br>
                    {if ($user->can_page('users|edituser|editrole'))}<br>
                    <li>
<br>
                        <a>Users</a><br>
                        <ul>
<br>
                            {if ($user->can_page('users'))}<br>
                                <li><a>Users and Roles</a></li>
<br>
                            {/if}<br>
                            {if ($user->can_page('edituser'))}<br>
                                <li><a>Add User</a></li>
<br>
                            {/if}<br>
                            {if ($user->can_page('editrole'))}<br>
                                <li><a>Add Role</a></li>
<br>
                            {/if}<br>
                        </ul>
<br>
                    </li>
<br>
                    {/if}<br>
                    {if ($user->can_page('warnings'))}<br>
                    <li>
<br>
                        {if ($user->can_page('warnings'))}<br>
                            <a>Warnings</a><br>
                        {/if}<br>
                    </li>
<br>
                    {/if}<br>
                    {if ($user->can_page('signal_monitoring'))}<br>
                    <li> <div class="clear">




            </div>
</li>
</ul>
</div>
</div>
</div>