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====== First XES Standard Definition ======

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