What are the characteristics of a seminal document?

Seminal document is a historical document of a profession. I don't know how to describe it in characteristics.

The definition of seminal is something related to semen or to the seeds of a plant. An example of seminal is the fluid containing the sperm required to make a baby. Seminal is defined as some discovery or event that strongly influenced what came after. An example of seminal was the discovery of electricity.