About: http://webisa.webdatacommons.org/270810855

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	To obtain access to a resource, a requester (e.g., a unit of work such as a process or a thread) tests the current value of the semaphore.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com