About: http://webisa.webdatacommons.org/150760353

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	From your description, I think you want \ifdefstring, as you need to compare one macro with one definition of a macro. \ifdefequal is for testing two macros for equivalence.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com