[Dini-ag-kim-bestandsdaten] [cKlee/holding-ontology] c08afe: Update holding.md

[Carsten Klee]

  Branch: refs/heads/master
  Home:   https://github.com/cKlee/holding-ontology
  Commit: c08afe61417fe6a241e5256b95a261e2dca1c1e6
      https://github.com/cKlee/holding-ontology/commit/c08afe61417fe6a241e5256b95a261e2dca1c1e6
  Author: Carsten Klee <carsten.klee at sbb.spk-berlin.de>
  Date:   2013-07-02 (Tue, 02 Jul 2013)

  Changed paths:
    M holding.md

  Log Message:
  -----------
  Update holding.md

added chronology definition