About: http://webisa.webdatacommons.org/254398524

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	So there are constraints, but mainly rules like these are designed to be simple.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com