(1) Evidence of the unwritten or common law of a foreign country may be adduced by producing a book containing reports of judgments of courts of the country if the book is or would be used in the courts of the country to inform the courts about the unwritten or common law of the country.
(2) Evidence of the interpretation of a statute of a foreign country may be adduced by producing a book containing reports of judgments of courts of the country if the book is or would be used in the courts of the country to inform the courts about the interpretation of the statute.