About: http://webisa.webdatacommons.org/238480479

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	Here, the update time is a time taken by the source clock to pass through the first clock delay unit (540 and 560), the second clock delay unit (550 and 570), and the first phase comparator 520.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com