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Re: [netmod] AD review of draft-ietf-netmod-system-mgmt

Martin Bjorklund <mbj@tail-f.com> Fri, 13 December 2013 07:22 UTC

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Date: Fri, 13 Dec 2013 08:22:25 +0100
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To: randy_presuhn@mindspring.com
From: Martin Bjorklund <mbj@tail-f.com>
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Cc: netmod@ietf.org
Subject: Re: [netmod] AD review of draft-ietf-netmod-system-mgmt
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Randy Presuhn <randy_presuhn@mindspring.com> wrote:
> Hi -
> 
> >From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
> >Sent: Dec 12, 2013 3:52 AM
> >To: Randy Presuhn <randy_presuhn@mindspring.com>, h@elstar.local
> >Cc: netmod@ietf.org
> >Subject: Re: [netmod] AD review of draft-ietf-netmod-system-mgmt
> >
> >On Thu, Dec 12, 2013 at 12:42:57AM -0800, Randy Presuhn wrote:
> >>
> >> >    o  An implementation MUST allow any legal "string" (YANG string).
> >> 
> >> There are good reasons to restrict formatting and control characters -
> >> I'll assume YANG strings do this already.  If not, that's another long
> >> discussion.
> >
> >RFC 6020 says:
> >
> >   The string built-in type represents human-readable strings in YANG.
> >   Legal characters are tab, carriage return, line feed, and the legal
> >   characters of Unicode and ISO/IEC 10646 [ISO.10646]:
> >
> >     ;; any Unicode character, excluding the surrogate blocks,
> >     ;; FFFE, and FFFF.
> >     string = *char
> >     char = %x9 / %xA / %xD / %x20-D7FF / %xE000-FFFD /
> >            %x10000-10FFFF
> >
> >And so far, we have used these strings without further restrictions in
> >data models when there was something to be named.
> 
> Very odd.  It restricts the C0 controls, but permits the C1
> control codes?  I hope someone thought that through carefully.

It is what XML Schema 1.0 says is a string.  See
http://www.w3.org/TR/xmlschema-2/#string and the reference to
http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Char


/martin

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