About: http://webisa.webdatacommons.org/196919967

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	A presently preferred semi-porous material is cement, although a semi-porous ceramic, clay, or other material could be utilized.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr