- Subject of the study: eg. archeology, history, anthropology
- Description of the object of study: eg. settlement, burial, spearheads
- Determining the chronology: eg. Stone Age, early Middle Ages, 16 century, 1945-1950 (century Arabic numerals)
- The geographical description: eg. Pomerania, Szczecin, lower Nadodrze
- Number of keywords: minimum 4 - maximum 6
- Keywords should be recorded in lowercase, unless it is a name