OpenID specifications are developed by the community on technical specification mailing lists overseen by specs@openid.net. The current community of editors look to make sure that any draft proposal agrees with the general principals of how OpenID has evolved in terms of being no more complicated than needed to get the job done, modular, free and unencumbered, as well as being further extensible. Only the specifications listed in the “Finalized Specifications” section are considered official OpenID specifications while everything listed in the “Proposed Drafts” section are still being discussed and evolved by the community.

Finalized Specifications

• OpenID Authentication 2.0 (txt)
• OpenID Attribute Exchange 1.0 (txt)
• OpenID Authentication 1.1 (txt)
• OpenID Simple Registration Extension 1.0 (txt)
• Yadis Discovery Protocol (Developed separately from OpenID, though used in 2.0)

Proposed Drafts

• OpenID Data Transport Protocol - Draft 3
  • Service Key Discovery (txt)
  • Messages (txt)
• OpenID Simple Registration Extension 1.1 - Draft 1 (txt)
• OpenID Provider Authentication Policy Extension - Draft 5

Past Specifications

• OpenID Authentication 1.1 (original format)
• OpenID Authentication 1.0 (original format)

You can view a listing of all the specs by visiting http://openid.net/specs/.