About: http://webisa.webdatacommons.org/335460644

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 semaphore is an operating system managed software flag used to coordinate the actions of concurrent threads and processes.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com