<http://webisa.webdatacommons.org/prov/389621679>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/151997063> .
<http://webisa.webdatacommons.org/151997063>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/151997063>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<docstoc.com> .
<http://webisa.webdatacommons.org/151997063>	<http://www.w3.org/ns/prov#value>	"certification systems are reviewed in detail, other types of systems are reviewed only briefly." .