Re: [netmod] [Editorial Errata Reported] RFC7950 (5698)

Martin Bjorklund <mbj@tail-f.com> Wed, 24 April 2019 10:06 UTC

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Date: Wed, 24 Apr 2019 12:06:33 +0200 (CEST)
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From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [netmod] [Editorial Errata Reported] RFC7950 (5698)
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Hi,

This errata is correct and should be accepted.


/martin


RFC Errata System <rfc-editor@rfc-editor.org> wrote:
> The following errata report has been submitted for RFC7950,
> "The YANG 1.1 Data Modeling Language".
> 
> --------------------------------------
> You may review the report below and at:
> http://www.rfc-editor.org/errata/eid5698
> 
> --------------------------------------
> Type: Editorial
> Reported by: Andy Bierman <andy@yumaworks.com>
> 
> Section: 7.5.4.3
> 
> Original Text
> -------------
>      container interface {
>        leaf ifType {
>          type enumeration {
>            enum ethernet;
>            enum atm;
>          }
>        }
>        leaf ifMTU {
>          type uint32;
>        }
>        must 'ifType != "ethernet" or ifMTU = 1500' {
>          error-message "An Ethernet MTU must be 1500";
>        }
>        must 'ifType != "atm" or'
>           + ' (ifMTU <= 17966 and ifMTU >= 64)' {
>          error-message "An ATM MTU must be 64 .. 17966";
>        }
>      }
> 
> 
> Corrected Text
> --------------
>      container interface {
>        leaf ifType {
>          type enumeration {
>            enum ethernet;
>            enum atm;
>          }
>        }
>        leaf ifMTU {
>          type uint32;
>        }
>        must 'string(ifType) != "ethernet" or ifMTU = 1500' {
>          error-message "An Ethernet MTU must be 1500";
>        }
>        must 'string(ifType) != "atm" or'
>           + ' (ifMTU <= 17966 and ifMTU >= 64)' {
>          error-message "An ATM MTU must be 64 .. 17966";
>        }
>      }
> 
> 
> Notes
> -----
> The intent of the example is for each must-stmt to be false if the ifType leaf does not exist.
> However the XPath is incorrect.
> 
> From the XPath 1.0 spec, section 3.4, para 5
> 
> If one object to be compared is a node-set and the other is a string, then the comparison will be true if and only if there is a node in the node-set such that the result of performing the comparison on the string-value of the node and the other string is true. 
> 
> The empty node-set is not implicitly converted to an empty string for a = or != comparison.
> Instead the string() function must explicitly convert the node-set to a string
> 
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party  
> can log in to change the status and edit the report, if necessary. 
> 
> --------------------------------------
> RFC7950 (draft-ietf-netmod-rfc6020bis-14)
> --------------------------------------
> Title               : The YANG 1.1 Data Modeling Language
> Publication Date    : August 2016
> Author(s)           : M. Bjorklund, Ed.
> Category            : PROPOSED STANDARD
> Source              : Network Modeling
> Area                : Operations and Management
> Stream              : IETF
> Verifying Party     : IESG
>