Typecho front-end and back-end separation?

<code><?php if (!defined('__TYPECHO_ROOT_DIR__')) exit; ?>
<?php $this->need('header.php'); ?>

    <div class="col-mb-12 col-8" id="main" role="main">
        <h3 class="archive-title"><?php $this->archiveTitle(array(
            'category'  =>  _t('分类 %s 下的文章'),
            'search'    =>  _t('包含关键字 %s 的文章'),
            'tag'       =>  _t('标签 %s 下的文章'),
            'author'    =>  _t('%s 发布的文章')
        ), '', ''); ?></h3>
        <?php if ($this->have()): ?>
        <?php while($this->next()): ?>
            <article class="post" itemscope itemtype="http://schema.org/BlogPosting">
                <h2 class="post-title" itemprop="name headline"><a itemtype="url" href="<?php $this->permalink() ?>"><?php $this->title() ?></a></h2>
                <ul class="post-meta">
                    <li itemprop="author" itemscope itemtype="http://schema.org/Person"><?php _e('作者: '); ?><a itemprop="name" href="<?php $this->author->permalink(); ?>" rel="author"><?php $this->author(); ?></a></li>
                    <li><?php _e('时间: '); ?><time datetime="<?php $this->date('c'); ?>" itemprop="datePublished"><?php $this->date('F j, Y'); ?></time></li>
                    <li><?php _e('分类: '); ?><?php $this->category(','); ?></li>
                    <li itemprop="interactionCount"><a href="<?php $this->permalink() ?>#comments"><?php $this->commentsNum('评论', '1 条评论', '%d 条评论'); ?></a></li>
                </ul>
                <div class="post-content" itemprop="articleBody">
                    <?php $this->content('- 阅读剩余部分 -'); ?>
                </div>
            </article>
        <?php endwhile; ?>
        <?php else: ?>
            <article class="post">
                <h2 class="post-title"><?php _e('没有找到内容'); ?></h2>
            </article>
        <?php endif; ?>

        <?php $this->pageNav('&laquo; 前一页', '后一页 &raquo;'); ?>
    </div><!-- end #main -->

    <?php $this->need('sidebar.php'); ?>
    <?php $this->need('footer.php'); ?>
</code>

<code><?php if (!defined('__TYPECHO_ROOT_DIR__')) exit; ?>
<?php $this->need('header.php'); ?>

    <div class="col-mb-12 col-8" id="main" role="main">
        <h3 class="archive-title"><?php $this->archiveTitle(array(
            'category'  =>  _t('分类 %s 下的文章'),
            'search'    =>  _t('包含关键字 %s 的文章'),
            'tag'       =>  _t('标签 %s 下的文章'),
            'author'    =>  _t('%s 发布的文章')
        ), '', ''); ?></h3>
        <?php if ($this->have()): ?>
        <?php while($this->next()): ?>
            <article class="post" itemscope itemtype="http://schema.org/BlogPosting">
                <h2 class="post-title" itemprop="name headline"><a itemtype="url" href="<?php $this->permalink() ?>"><?php $this->title() ?></a></h2>
                <ul class="post-meta">
                    <li itemprop="author" itemscope itemtype="http://schema.org/Person"><?php _e('作者: '); ?><a itemprop="name" href="<?php $this->author->permalink(); ?>" rel="author"><?php $this->author(); ?></a></li>
                    <li><?php _e('时间: '); ?><time datetime="<?php $this->date('c'); ?>" itemprop="datePublished"><?php $this->date('F j, Y'); ?></time></li>
                    <li><?php _e('分类: '); ?><?php $this->category(','); ?></li>
                    <li itemprop="interactionCount"><a href="<?php $this->permalink() ?>#comments"><?php $this->commentsNum('评论', '1 条评论', '%d 条评论'); ?></a></li>
                </ul>
                <div class="post-content" itemprop="articleBody">
                    <?php $this->content('- 阅读剩余部分 -'); ?>
                </div>
            </article>
        <?php endwhile; ?>
        <?php else: ?>
            <article class="post">
                <h2 class="post-title"><?php _e('没有找到内容'); ?></h2>
            </article>
        <?php endif; ?>

        <?php $this->pageNav('&laquo; 前一页', '后一页 &raquo;'); ?>
    </div><!-- end #main -->

    <?php $this->need('sidebar.php'); ?>
    <?php $this->need('footer.php'); ?>
</code>