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https://issues.apache.org/jira/browse/IMAP-73?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696044#action_12696044
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Robert Burrell Donkin commented on IMAP-73:
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>From RFC3348:
<blockquote cite='http://www.isi.edu/in-notes/rfc3348.txt'>
\HasNoChildren - The presence of this attribute indicates that the
mailbox has NO child mailboxes that are accessible to the currently
authenticated user. If a mailbox has the \Noinferiors attribute, the
\HasNoChildren attribute is redundant and SHOULD be omitted in the
LIST response.
In some instances a server that supports the CHILDREN extension MAY
NOT be able to determine whether a mailbox has children. For example
it may have difficulty determining whether there are child mailboxes
when LISTing mailboxes while operating in a particular namespace.
In these cases, a server MAY exclude both the \HasChildren and
\HasNoChildren attributes in the LIST response. As such, a client
can not make any assumptions about whether a mailbox has children
based upon the absence of a single attribute.
It is an error for the server to return both a \HasChildren and a
\HasNoChildren attribute in a LIST response.
</blockquote>
> Support RFC 3348
> ----------------
>
> Key: IMAP-73
> URL: https://issues.apache.org/jira/browse/IMAP-73
> Project: JAMES Imap
> Issue Type: New Feature
> Components: Mailbox, Protocol
> Affects Versions: 0.1
> Reporter: Robert Burrell Donkin
> Fix For: 0.1
>
>
> RFC 3348 describes an extension to IMAP which allows clients to determine
> whether a mailbox has a child without an expensive general LIST operation
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