Should it be the date or the size of the document, pertinence to the case or another?

是文旦过的日期还是规格，与这个例子相关或其他的？

耶鲁公开课 - 心理学导论课程节选

At the beginning of each week, the author of a case study will present a brief document describing the key policy concerns faced by the institution and inviting the participants to comment on a number of issues or questions.

UNESCO: Communication and Information

In a couple of hours (or days, in the case of Facebook), an archived document will appear on your desktop.

FORBES: 4 Quick Ways To Back Up Your Daily Business Data

Another court document shows the funds were seized as part of a case being run by the Drug Enforcement Administration.

FORBES: Magazine Article