<https://db.cs.cmu.edu/events/db-seminar-summer-2019-db-group-tianyu-li/>
<http://schema.org/url>
<https://db.cs.cmu.edu/events/db-seminar-summer-2019-db-group-tianyu-li/>
<https://db.cs.cmu.edu/events/db-seminar-summer-2019-db-group-tianyu-li/>