(1)  Evidence of a fact that, because of sections 48 , 63 , 64 , 65 , 69 , 70 and 71 and Part 3 of Chapter 4 , is to be proved in relation to a document or thing may be given by a person permitted under section 171 to give such evidence.

(2)  Evidence may be given by affidavit or, if the evidence relates to a public document, by a written statement.