About: http://webisa.webdatacommons.org/251445824

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	There are also many difficulties in building such a system, including problems of integrating and coordinating databases and communications systems built for different purposes.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es