<http://webisa.webdatacommons.org/209990880>	<http://www.w3.org/ns/prov#value>	" // this copy constructor is an optimization: we do not need to copy the storage_ member," .
<http://webisa.webdatacommons.org/209990880>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<boost.org> .
<http://webisa.webdatacommons.org/prov/314323681>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/209990880> .
<http://webisa.webdatacommons.org/209990880>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .