About: http://webisa.webdatacommons.org/128452528

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 indicator, such as a flag, used to govern access to shared system resources, for maintaining order among processes that are competing for use of resources.
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com