For the purposes of this Act a document, including any instrument or part of an instrument, purports—
(a) to be of a certain character; or
(b) to have been produced or authenticated at a certain time, in a certain manner, by a certain person or body, or by a person having a certain qualification or occupying a certain office; or
(c) any other matter whatever;if the document expressly or impliedly represents that matter or a court can assume that matter from the contents of the document or otherwise.