Version of the Tag Set to which this document claims to be valid.
| Value | Meaning |
|---|---|
| iso-0.9 | Version 0.9 of ISO STS |
| iso-1.0 | Version 1.0 of ISO STS |
| iso-1.1 | Version 1.1 of ISO STS |
| 1.0 | Version 1.0 of NISO STS, an ANSI/NISO standard |
| 1.1d1 | Standing Committee Draft 1.1d1 of NISO STS |