
*Optional properties:*

``allocation`` : ``<string>``
  Media set allocation policy ('continue', 'always', or a calendar event).



``comment`` : ``<string>``
  Comment.



``encrypt`` : ``<string>``
  Tape encryption key fingerprint (sha256).



``retention`` : ``<string>``
  Media retention policy ('overwrite', 'keep', or time span).



``template`` : ``<string>``
  Media set naming template (may contain strftime() time format specifications).




