OpenXES Developer Guide
OpenXES Developer Guide version 2.0
Allowed empty logs and empty traces.
Introduced list and container attributes.
OpenXES Developer Guide version 1.9
Allowed classifier keys to be grouped using single quotes.
OpenXES Developer Guide version 1.8
Changed attribute key from xs:Name to xs:token.
OpenXES Developer Guide version 1.7
Added cost extension.
OpenXES Developer Guide version 1.6
Consolidates ID attribute.
Consolidates URLs.
Matches OpenXES version 1.6.
OpenXES Developer Guide version 1.0 RC7
OpenXES Developer Guide version 1.0 RC5