Re: [netmod] Reminder: WGLC - draft-ietf-netmod-yang-tree-diagrams
Robert Wilton <rwilton@cisco.com> Mon, 15 January 2018 15:48 UTC
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To: Martin Bjorklund <mbj@tail-f.com>
Cc: joelja@bogus.com, netmod@ietf.org, draft-ietf-netmod-yang-tree-diagrams@ietf.org
References: <66857af8-80b4-8c7c-f952-f04c3f2adaa7@cisco.com> <20180115.153933.1215610340924130656.mbj@tail-f.com> <9a7e9c47-c8bb-afdc-81d2-1799cfd635cf@cisco.com> <20180115.162623.2008313631188177181.mbj@tail-f.com>
From: Robert Wilton <rwilton@cisco.com>
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Date: Mon, 15 Jan 2018 15:48:38 +0000
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Subject: Re: [netmod] Reminder: WGLC - draft-ietf-netmod-yang-tree-diagrams
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On 15/01/2018 15:26, Martin Bjorklund wrote: > Robert Wilton <rwilton@cisco.com> wrote: >> Hi Martin, >> >> All OK with me except where I have further comments/questions inline >> below: >> >> On 15/01/2018 14:39, Martin Bjorklund wrote: >>> Hi, >>> >>> Thanks for the review! Comments inline. >>> >>> Robert Wilton <rwilton@cisco.com> wrote: >>>> Hi Lou, Martin >>>> >>>> I've done a quick review of draft -04. >>>> >>>> It looks well written to me. >>>> >>>> I have a spotted a few minor nits/questions. >>>> >>>> Section 1: >>>> >>>> (i) "Such diagrams are commonly used to provided " => "Such diagrams >>>> are used to provide"? >>> Ok. >>> >>>> (ii) "This document provides the syntax used in YANG Tree Diagrams." >>>> => "This document describes the syntax used in YANG Tree Diagrams", or >>>> if not "describes", perhaps "specifies"? >>> I changed to "describes". >>> >>>> (iii) "common practice is include" => "common practice is to include" >>> Ok. >>> >>>> Section 2: >>>> (iv) Are the top level data nodes really offset by 4 spaces, or should >>>> this be 2 spaces? The example in section 2, and section 4 seem to >>>> differ here. The submodule example in Sec 2.1 looks like it is using >>>> 2 spaces. >>> It should be 4 spaces. I fixed the example in 2.1. >> Hum, OK. Is this the right choice? >> - It means that the tree is indented 2 spaces further than everything >> else (e.g. groupings, augments, etc). > Well, I think it is consistent as it is now: > > module: <module-name> > +--<node> > | +--<node> > | +--<node> > +--<node> > +--<node> > +--<node> > > augment <target-node>: > +--<node> > +--<node> > +--<node> > +--<node> > > Nodes are always intended 4 spaces. Yes, agree that it is consistent, but personally I would also be happy for the nodes to be intended 2 spaces for the main tree, and then 4 spaces for everything else (effectively 2 spaces beyond the augment/rpc/etc). > >> - YANG modules in RFC's already struggle with line length anyway, >> hence wouldn't the use of 2 spaces give the model a bit more space. > This is a good argument. I'm happy to save spaces by using 2 instead: > > module: <module-name> > +--<node> > | +--<node> > | +--<node> > +--<node> > +--<node> > +--<node> > > augment <target-node>: > +--<node> > +--<node> > +--<node> > +--<node> I think that compact is better, if not quite so pretty, so this solution is also OK with me. Personally, I quite like a relative indent, i.e. the tree is intended 2 spaces more than its parent "thing", e.g. module: <module-name> +--<node> | +--<node> | +--<node> +--<node> +--<node> +--<node> augment <target-node>: +--<node> +--<node> +--<node> +--<node> > >> I also think that it would be good to check the indent of all the tree >> diagram snippets in the doc, it looks like they may be using somewhat >> varying levels of indents (between 2 and 6 spaces). > Ok. > > >>>> (v) "is prefaces with" => "is prefaced with" >>> Ok. >>> >>>> (vi) Section 2.2, should there be an example of an unexpanded uses >>>> statement? I was wondering if this section was under specified? >>> I have added: >>> >>> For example, the following diagram shows the "tls-transport" grouping >>> from [RFC7407] unexpanded: >>> >>> +--rw tls >>> +---u tls-transport >>> >>> If the grouping is expanded, it could be printed as: >>> >>> +--rw tls >>> +--rw port? inet:port-number >>> +--rw client-fingerprint? x509c2n:tls-fingerprint >>> +--rw server-fingerprint? x509c2n:tls-fingerprint >>> +--rw server-identity? snmp:admin-string >> Yes, looks good. >> >>>> Section 2.6: >>>> (vii) "If the node is augmented into the tree from another module, its >>>> name is printed as <prefix>:<name>." Does there need to be a >>>> clarification that the prefix name used is the one used by the >>>> module's import statement? Or does it use the prefix statement from >>>> the imported modules instead (I know that these should normally be the >>>> same, but this is not guaranteed). >>> Since this is used when a node is augmented *into* the main tree, it >>> can't be the prefix in import, since the augmenting module is not >>> imported from the augmented module. I did: >> But the YANG module must import the module that it is augmenting. If a >> local import prefix is used in the actual YANG module then it would be >> slightly harder to relate the tree output back to local import >> prefixes used in the YANG module. > Here's an example: > > module: ietf-interfaces > +--rw interfaces > | +--rw interface* [name] > | +--rw name string > ... > | +--rw ip:ipv4! > > ietf-interfaces doesn't import ietf-ip, so there is no other prefix to > use for "ipv4" than the one defined in ietf-ip! Ah, yes, OK. I was assuming that the tree diagram would always be done from the augmenting module, but clearly that is not necessarily the case. > >>> OLD: >>> >>> If the node is augmented into the tree from another module, >>> its name is printed as <prefix>:<name>. >>> >>> NEW: >>> >>> If the node is augmented into the tree from another module, >>> its name is printed as <prefix>:<name>, where <prefix> is the >>> prefix defined in the module where the node is defined. >> This is OK with me, but there is still a potential for a prefix >> namespace clash (since prefixes are not guaranteed to be unique). >> >> An alternative solution would be for the YANG tree diagram to list (at >> the beginning or the end of the diagram) the mappings from prefix -> >> module name used. > The tree diagram is supposed to give a simplified overview of the > structure of a module. I agree with your statemenet below that such a > mappig adds noise... I prefer to keep the diagram as is. That is fine with me, really just raising so that the point could be discussed and closed. Thanks, Rob > > > /martin > > >> This has the bonus that it also explicitly lists >> the YANG modules that are being augmented, but conversely, this might >> end up just adding unnecessary noise to a diagram that should be short >> and simple ... >> >> A second alternative would be to add some vague text to state that the >> prefix to module mapping should be explicitly listed in any cases >> where the prefix name alone is not obvious. >> >> Thanks, >> Rob >> >> >>>> Section 3.2. >>>> (viii) It would be slightly easier to read if there wasn't a linebreak >>>> between "--" and "tree-print-groupings", not sure if that is feasible >>>> to force this. >>> I don't think I can enforce this, but I'll look into it. If nothing >>> else, the RFC editor will fix this. >>> >>> >>> /martin >>> >>> >>>> Thanks, >>>> Rob >>>> >>>> On 10/01/2018 16:16, joel jaeggli wrote: >>>>> Just a reminder given the date that this was posted. This last call is >>>>> expected to complete Monday 1/15/18. >>>>> >>>>> Thanks >>>>> >>>>> joel >>>>> >>>>> >>>>> On 1/1/18 2:01 PM, joel jaeggli wrote: >>>>>> Greetings, >>>>>> >>>>>> We hope the new year is a time to make great progess on outstanding >>>>>> documents before preparation for the London IETF begins in earnest. >>>>>> >>>>>> This starts a two-week working group last call on: >>>>>> >>>>>> YANG Tree Diagrams >>>>>> draft-ietf-netmod-yang-tree-diagrams >>>>>> >>>>>> https://datatracker.ietf.org/doc/draft-ietf-netmod-yang-tree-diagrams/ >>>>>> >>>>>> Please send email to the list indicating your support or concerns. >>>>>> >>>>>> We are particularly interested in statements of the form: >>>>>> >>>>>> * I have reviewed this draft and found no issues. >>>>>> * I have reviewed this draft and found the following issues: ... >>>>>> >>>>>> >>>>>> Thank you, >>>>>> NETMOD WG Chairs >>>>>> >>>>>> >>>>>> >>>>>> >>>>> _______________________________________________ >>>>> netmod mailing list >>>>> netmod@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/netmod >>>>> . >>>>> >>> . >>> > . >
- [netmod] WGLC - draft-ietf-netmod-yang-tree-diagr… joel jaeggli
- [netmod] Reminder: WGLC - draft-ietf-netmod-yang-… joel jaeggli
- [netmod] 答复: Reminder: WGLC - draft-ietf-netmod-y… Qin Wu
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… t.petch
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Benoit Claise
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Robert Wilton
- Re: [netmod] Reminder: WGLC - draft-ietf-netmod-y… Robert Wilton
- Re: [netmod] Reminder: WGLC - draft-ietf-netmod-y… Martin Bjorklund
- Re: [netmod] Reminder: WGLC - draft-ietf-netmod-y… Robert Wilton
- Re: [netmod] Reminder: WGLC - draft-ietf-netmod-y… Acee Lindem (acee)
- Re: [netmod] Reminder: WGLC - draft-ietf-netmod-y… Lou Berger
- Re: [netmod] Reminder: WGLC - draft-ietf-netmod-y… Martin Bjorklund
- Re: [netmod] Reminder: WGLC - draft-ietf-netmod-y… Robert Wilton
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Vladimir Vassilev
- Re: [netmod] Reminder: WGLC - draft-ietf-netmod-y… Martin Bjorklund
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Vladimir Vassilev
- Re: [netmod] Reminder: WGLC - draft-ietf-netmod-y… Benoit Claise
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Martin Bjorklund
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Vladimir Vassilev
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Robert Wilton
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Martin Bjorklund
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Lou Berger
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Robert Wilton
- Re: [netmod] Reminder: WGLC - draft-ietf-netmod-y… joel jaeggli
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… joel jaeggli
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Vladimir Vassilev
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Juergen Schoenwaelder
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Alexander Clemm
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Martin Bjorklund
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Juergen Schoenwaelder
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Vladimir Vassilev
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Juergen Schoenwaelder
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Robert Wilton
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… t.petch
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Martin Bjorklund
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Robert Wilton
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Juergen Schoenwaelder
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Benoit Claise
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… Jeff Tantsura
- Re: [netmod] WGLC - draft-ietf-netmod-yang-tree-d… t.petch
- [netmod] Closure - : WGLC - draft-ietf-netmod-yan… joel jaeggli
- Re: [netmod] Closure - : WGLC - draft-ietf-netmod… Martin Bjorklund