About: http://webisa.webdatacommons.org/9147520

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 problem with such support systems is that they may be subject to lifting forces, such as wind, which tend to lift the header and joist from the base or the joist from the header.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com