"An antelope running wild on the plains of Africa should not be considered a document, she rules. But if it were to be captured, taken to a zoo and made an object of study, it has been made into a document. It has become physical evidence being used by those who study it. Not only that, but scholarly articles written about the antelope are secondary documents, since the antelope itself is the primary document."
— from What is a "Document"? by Michael Buckland