<http://webisa.webdatacommons.org/175631944>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/175631944>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.ca> .
<http://webisa.webdatacommons.org/175631944>	<http://www.w3.org/ns/prov#value>	"A photonic crystal is a material with a periodic index modulation that restricts the transmission of light to a defined set of wavevectors or ???bands???." .
<http://webisa.webdatacommons.org/prov/48508780>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/175631944> .