http://schema.org/contentLocation

"Discussing how to represent where a Movie was filmed, e.g. productionCountry. Discussing CreativeWork's existing contentLocation property, it is clear the text is ambiguous.

http://schema.org/contentLocation "The location of the content." (Place)

Is this where a book is currently located? In real life? Or about-ness, e.g. Pirates of the Caribbean is about the Caribbean?"