| Member | Description |
|---|---|
| UNKNOWN | Unknown document version. |
| VERSION_1_0 | PDF 1.0 - Adobe Acrobat 1 |
| VERSION_1_1 | PDF 1.1 - Adobe Acrobat 2 |
| VERSION_1_2 | PDF 1.2 - Adobe Acrobat 3 |
| VERSION_1_3 | PDF 1.3 - Adobe Acrobat 4 |
| VERSION_1_4 | PDF 1.4 - Adobe Acrobat 5 |
| VERSION_1_5 | PDF 1.5 - Adobe Acrobat 6 |
| VERSION_1_6 | PDF 1.6 - Adobe Acrobat 7 |
| VERSION_1_7 | PDF 1.7 - Adobe Acrobat 8 |
| VERSION_2_0 | PDF 2.0 |