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The current definition of SBML Level 1 is Version 2.

Systems Biology Markup Language (SBML) Level 1: Structures and Facilities for Basic Model Definitions

Authors: Michael Hucka, Andrew Finney, Herbert Sauro, and
Hamid Bolouri.

This is the SBML Level 1 Version 2 specification, made publicly available on 28 August 2003. It supercedes the Level 1 Version 1 specification.

Note that SBML Level 1 currently does not have release numbers because the release numbering system was introduced after the last version of Level 1 was produced. Future versions of SBML Level 1 may introduce a similar number scheme to that used for Level 2.

The document links refer to the files on If you have any problems accessing the files from there, local backup copies of the PDF and PS files are also available from this server.

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