<http://webisa.webdatacommons.org/394193414>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/394193414>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<wikipedia.org> .
<http://webisa.webdatacommons.org/prov/438295649>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/394193414> .
<http://webisa.webdatacommons.org/394193414>	<http://www.w3.org/ns/prov#value>	"In control theory, observability is a measure for how well internal states of a system can be inferred by knowledge of its external outputs." .