About: http://webisa.webdatacommons.org/301832224

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 one (1) signal with a signal width nT, in which n is a positive integer, and T is a clock unit time, after the modulation of the signal, is an electromagnetic wave pulse string or a recording light pulse string having:
http://www.w3.org/ns/prov#wasQuotedFrom	google.com