How to handle special use folders in Sieve?

[OBATA Akio via Info-cyrus <info-cyrus@xxxxxxxxxxxxxxxxxxxx>]

Hi,

Since 3.0.0-beta2 release note's "Major changes since the 2.5.x series":

* Sieve now supports special use folders. See Cyrus Sieve

 http://cyrusimap.org/imap/admin/sieve.html#cyrus-sieve-specialuse

But I cannot find how to do it in sieve script.

For example, how to rewrite following script with such feature?

  if header :is "X-Spam-Flag" "YES" {
    fileinto "INBOX.Junk"
  }

--
OBATA Akio / obata@xxxxxxx
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