About: http://webisa.webdatacommons.org/440724814

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	This means it will be defined in all source files including the header file, and you will get the linker error you describe.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com