<http://webisa.webdatacommons.org/176371543>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.es> .
<http://webisa.webdatacommons.org/prov/472210594>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/176371543> .
<http://webisa.webdatacommons.org/176371543>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/176371543>	<http://www.w3.org/ns/prov#value>	"To create a variable, for example variable A that binds to instances of a relation, a fetch_source relation and a fetch_destination relation are previously created explicitly, using variable A as the source for both of them." .