Re: [Netconf] Existence of Non-Presence Containers
Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Thu, 28 June 2018 19:02 UTC
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Date: Thu, 28 Jun 2018 21:02:20 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: "Gary Wu (garywu)" <garywu=40cisco.com@dmarc.ietf.org>
Cc: "netconf@ietf.org" <netconf@ietf.org>
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Subject: Re: [Netconf] Existence of Non-Presence Containers
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On Thu, Jun 28, 2018 at 04:54:02PM +0000, Gary Wu (garywu) wrote: > Hi NETCONF WG, > > I have a question about the definition of existence as it applies to > non-presence containers and the expected behavior when one performs a "create" > or "delete" operation on them in an <edit-config>. > > RFC 6020 states: > > 7.5.8. NETCONF <edit-config> Operations > ... > > If a container does not have a "presence" statement and the last > child node is deleted, the NETCONF server MAY delete the container. > ... > > The way I read this is that the existence of non-presence containers that have > no child data, as it relates to <edit-config>, is implementation-defined. The text says that if after applying edits there is an empty non-presence container left in the datastore, then the server may delete it. > Another place where the existence of non-presence containers is mentioned is > for the XPath context. > > RFC 7950 states: > > 6.4.1. XPath Context > ... > > If a node that exists in the accessible tree has a non-presence > container as a child, then the non-presence container also exists in > the accessible tree. > ... This says non-presence containers always exist in the xpath context. > This seems to clearly define existence for non-presence containers, which has > implications on whether the container's child "must" statements are evaluated. > However, it does not say whether existence in the XPath context is equivalent > to existence in <edit-config> operations. As well, this passage seems to have > been introduced for YANG 1.1 and is not present in RFC 6020. None of the quoted texts talks about "existence [on non-presence containers] in <edit-config> operations". The first text talks about data in a configuration datastore, the second text talks about the xpath context. /js -- Juergen Schoenwaelder Jacobs University Bremen gGmbH Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany Fax: +49 421 200 3103 <https://www.jacobs-university.de/>
- Re: [Netconf] Existence of Non-Presence Containers Juergen Schoenwaelder
- [Netconf] Existence of Non-Presence Containers Gary Wu (garywu)