<http://webisa.webdatacommons.org/prov/134627389>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/90999372> .
<http://webisa.webdatacommons.org/90999372>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/90999372>	<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://webisa.webdatacommons.org/prov/164837916>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/90999372> .
<http://webisa.webdatacommons.org/90999372>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<docstoc.com> .