Google plus 如何将Schema.org标记添加到电子邮件中以供Google Plus审查？

看看——特别是这个。提供以下虚拟示例：

<div itemscope itemtype="http://schema.org/EmailMessage">
    <div itemprop="action" itemscope itemtype="http://schema.org/ReviewAction">
        <div itemprop="review" itemscope itemtype="http://schema.org/Review">
            <div itemprop="itemReviewed" itemscope itemtype="http://schema.org/FoodEstablishment">
                <meta itemprop="name" content="Joe's Diner"/>
            </div>
            <div itemprop="reviewRating" itemscope itemtype="http://schema.org/Rating">
                <meta itemprop="bestRating" content="5"/>
                <meta itemprop="worstRating" content="1"/>
            </div>
        </div>
        <div itemprop="handler" itemscope itemtype="http://schema.org/HttpActionHandler">
            <link itemprop="url" href="http://reviews.com/review?id=123"/>
            <div itemprop="requiredProperty" itemscope itemtype="http://schema.org/Property">
                <meta itemprop="name" content="review.reviewRating.ratingValue"/>
            </div>
            <link itemprop="method" href="http://schema.org/HttpRequestMethod/POST"/>
        </div>
    </div>
    <meta itemprop="description" content="We hope you enjoyed your meal at Joe's Diner. Please rate your experience."/>
</div>

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是否有某种方法可以自定义此功能？

ReviewAction要求您输入一个URL，以便将审核数据提交到该URL。Google+评论不提供这样的API，因此您最好让用户留下评论并链接到评论列表