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

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";

Lada

> 
> Thanks,
> Ian 
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Ladislav Lhotka
Head, CZ.NIC Labs
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