<http://webisa.webdatacommons.org/253870260>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<postgresqlconference.org> .
<http://webisa.webdatacommons.org/253870260>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/253870260>	<http://www.w3.org/ns/prov#value>	"Polymorphism: Suppose your blog supports comments, but then your comments need to reference multiple types of content, for example news, blog articles, and videos." .
<http://webisa.webdatacommons.org/prov/436317655>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/253870260> .