<http://webisa.webdatacommons.org/15274698>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<controlglobal.com> .
<http://webisa.webdatacommons.org/prov/489767388>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/15274698> .
<http://webisa.webdatacommons.org/15274698>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/15274698>	<http://www.w3.org/ns/prov#value>	"This minimum cost can be an optimum with respect to the column involved, but it is only a ??sub-optimum?? with respect to the total process of which the column is a part." .