There are four types of keywords, as listed in the table below. The first and second categories ensure the direct usefulness of the file. The third and fourth category state who is responsible for the contents of the file and how (via which procedures) the data in the file was obtained.
| See which? |
| See which? |
| See which? |
| See which? |
...
Procedure descriptive code words state which procedures have been followed, such as how the measuring, sampling, analysing, archiving and reporting activities have been carried out, which additional information was received or was required, and which calculation method was used. Interpretation of the data belonging to these code words is only possible if the procedure used for the measurement or analysis is known.
File tracing
Data descriptive
...
| COLUMN | COLUMNVOID | COLUMNINFO | COLUMNMINMAX |
| COLUMNSEPARATOR | COLUMNTEXT | DATATYPE | DATAFORMAT |
| FIRSTSCAN | LASTSCAN | RECORDSEPARATOR | ROW |
| QNMINMAX | QNTIME | QNVOID | SCANFREQ |
| SCANTIME | STARTDATE | STARTTIME | TIMECOLUMN |
File descriptive
...
...
Procedure descriptive
1. Sample descriptive
...
2 2. Setup descriptive
...
3. Measuring descriptive
4. Analysis descriptive
...
5. Report descriptive
...
6. Archive descriptive
...
...