[Dini-ag-kim-bestandsdaten] [cKlee/holding-ontology] e213fc: Update holding.md

[Carsten Klee]

  Branch: refs/heads/master
  Home:   https://github.com/cKlee/holding-ontology
  Commit: e213fc44142475213c17f649028ee83eac24c984
      https://github.com/cKlee/holding-ontology/commit/e213fc44142475213c17f649028ee83eac24c984
  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:
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  Update holding.md

Added further information on Chronology