<http://schema.org/topics>
"apps,Apps and Software,fitbit,Health &amp; Fitness,Google,Google Fit,Google I/O 2014,Health &amp; Fitness,Mobile,smartwatches,Tech,Uncategorized"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2014/06/27/healthkit-google-fit-apps/>