{
   "class" : {
      "rdf:type" : "rdfs:Class",
      "rdfs:comment" : "Quantity: Duration (use [ISO 8601 duration format](http://en.wikipedia.org/wiki/ISO_8601)).",
      "rdfs:label" : "Duration",
      "rdfs:subClassOf" : "schema:Quantity"
   },
   "properties" : {}
}