<http://schema.org/description>
"You know what the following is? db.blog_posts.find({status: {$in: [&amp;quot;draft&amp;quot;, &amp;quot;waiting on proof&amp;quot;, &amp;quot;approved&amp;quot;]}}).sort({_id: -1})             What is a MongoDB operator?     MongoDB operators are commands that compare ranges of values, such as $in, $nin, and $sort...."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.compose.io/articles/improve-performance-by-removing-query-logic/>