All Versions of SBML Level 1
In SBML Level 1, the approach of using Releases of SBML specifications was not yet instituted for producing updated revisions within a given SBML Level/Version combination. Only the "Final" versions of Level 1 Version 1 and Version 2 exist.
SBML Level 1 Version 2
The current definition of SBML Level 1 is Version 2.