<http://webisa.webdatacommons.org/427958626>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stanford.edu> .
<http://webisa.webdatacommons.org/427958626>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/315474085>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/427958626> .
<http://webisa.webdatacommons.org/427958626>	<http://www.w3.org/ns/prov#value>	"constraints are a requirement" .