About: http://webisa.webdatacommons.org/309848421

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	The cavity may be formed within a solid material comprising the other optical media, or may be formed by a container, such as a container of glass, semiconductor, crystal, plastic, or other suitable material.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com