Re: [netmod] xpaths and Wrapping Long Lines - draft-ietf-netmod-yang-tree-diagrams-03

Martin Bjorklund <mbj@tail-f.com> Thu, 21 December 2017 10:39 UTC

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Cc: ianfarrer@gmx.com, draft-ietf-netmod-yang-tree-diagrams@ietf.org, netmod@ietf.org
From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [netmod] xpaths and Wrapping Long Lines - draft-ietf-netmod-yang-tree-diagrams-03
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Ladislav Lhotka <lhotka@nic.cz> wrote:
> Hi Ian,
> 
> On Thu, 2017-12-21 at 10:42 +0100, Ian Farrer wrote:
> > Hi,
> > 
> > I’m just looking at the guidance on wrapping long lines given in Section 3.1.
> > Unfortunately, this doesn’t cover the case where I refer to a long path. E.g:
> > 
> > augment /nat:nat/nat:instances/nat:instance/nat:mapping-table/nat:mapping-
> > entry:
> > 
> > In this case, the total length (unindented) is 80 characters, 82 indented and
> > the path is 72 characters. Moving the path onto it’s own line with indents
> > will exceed the 72 character limit, so I need a line break in the path. What’s
> > the correct way to do this?
> 
> XPath syntax permits whitespace between tokens, but the argument of "augment" is
> a schema node identifier and not XPath. The ABNF productions for schema node
> identifiers do not permit whitespace but you can always use string
> concatenation:
> 
> augment "/nat:nat/nat:instances/nat:instance/"
>       + "nat:mapping-table/nat:mapping-entry";

But this is in the YANG source; I think Ian asked about the tree
diagram syntax.  Maybe the corresponding syntax in the tree diagram
could be simply:

augment /nat:nat/nat:instances/nat:instance
        /nat:mapping-table/nat:mapping-entry:

Or even simpler, maybe we can say that any string in the tree diagram
syntax can follow the YANG string rules.



/martin