About: http://webisa.webdatacommons.org/355372362

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	One exception would be, as you suggest, if the book is signed from an author to another noted person -- whether that person is an author or famous for some other endeavor.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com