About: http://webisa.webdatacommons.org/407162782

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	When unfolded it forms a series of connected cavities into which stones, sand or other building or engineering materials can be packed.
http://www.w3.org/ns/prov#wasQuotedFrom	wipo.int