About: http://webisa.webdatacommons.org/273707433

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	A summary task's start date is the earliest start of its sub-tasks, the finish date is the latest finish date of its subtasks, and its duration is the total span of its subtasks.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com