First XES Standard Definition
First XES Standard Definition version 2.0
Allowed empty logs and empty traces.
Introduced list and container attributes.
First XES Standard Definition version 1.4
Allowed classifier keys to be grouped by single quotes.
First XES Standard Definition version 1.3
Changed attribute keys from xs:Name to xs:token.
First XES Standard Definition version 1.2
Added ID and cost extension.
First XES Standard Definition version 1.1
Consolidates ID attributes.
First XES Standard Definition version 1.0
Initial proposal.