[Ietf-caldav] non-calendar resources in calendar collections

[Brian Moseley]

i'd like to re-examine the decision to blanket disallow non-calendar
resources within calendar collections.

i recognize that for some servers it may not be possible to allow
anything other than an event or task to be put into a calendar
collection, but surely some would like to be able to support this
without contradicting the spec

why not state that servers MAY allow non-calendar resources in
calendar collections, and that PUTs containing resources that are not
supported will return 415 responses?