<http://schema.org/topics>
"Australia,Climate,Mount Rabaul,Mount Tavurvur,New Guinea,Travel,Travel &amp; Leisure,Uncategorized,World,volcano"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2014/08/29/life-threatening-volcano-papua-new-guinea-mount-rabaul/>