About: http://webisa.webdatacommons.org/90999372

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	Generally, the covers are made of some sort of fabric, often coated with a polymericmaterial, which is detachably fastenable to a rigid frame so as to enclose and protect a given area.
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com