[Ietf-calsify] How to derive FREEBUSY;FBTYPE from a VEVENT?

[Bernard Desruisseaux]

The FBTYPE parameter of FREEBUSY properties of VFREEBUSY components
can take one of the following values:

  - FREE
  - BUSY
  - BUSY-UNAVAILABLE
  - BUSY-TENTATIVE
  - x-name

How can a calendar application (e.g., CalDAV Server) derive the
proper FBTYPE value from a given VEVENT?

Assuming that the FBTYPE parameter of the FREEBUSY property of
a VFREEBUSY component should be derived from the TRANSP and
STATUS properties of the VEVENT component, does the following
table make sense?

     +---------------------------++------------------+
     |          VEVENT           || VFREEBUSY        |
     +-------------+-------------++------------------+
     | TRANSP      | STATUS      || FBTYPE           |
     +=============+=============++==================+
     | TRANSPARENT | <Any value> || FREE             |
     +-------------+-------------++------------------+
     |             | CANCELLED   || FREE             |
     |             +-------------++------------------+
     |             | <Undefined> || BUSY             |
     | OPAQUE      | CONFIRMED   ||                  |
     | <Undefined> +-------------++------------------+
     |             |    ???      || BUSY-UNAVAILABLE |
     |             +-------------++------------------+
     |             | TENTATIVE   || BUSY-TENTATIVE   |
     +-------------+-------------++------------------+

When would a calendar application derive FBTYPE=BUSY-UNAVAILABLE ?

When would a calendar application derive FBTYPE=x-name ?

Cheers,
Bernard