The "acronym" link navigates to the latest version of the specification, this link changes whenever a new version of the specification is published.
The "Version" link navigates to the specific version.

Name Acronym Version Status Publication Date
Total: 3
Business Process Model And Notation BPMN™ 2.0.1 formal September 2013
Notification Service NOT 1.0.1 formal August 2002
Production Rule Representation PRR 1.0 formal December 2009