[DFDL-WG] clarification: textBooleanTrue/FalseRep cannot be empty string? textStandardNaNRep and friends cannot be empty string.

[Mike Beckerle]

I believe the analogy is not quite right.

For zero, having textStandardZeroRep "" means that the "ordinary" string
for zero i.e., "0" means zero. There's an implied string conceptually.

But for NaN and Inf there is no "ordinary" string to fall back on. They
would have to cause an error. I think just prohibiting these from being ""
is a better choice.

....mikeb


Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
www.tresys.com
Please note: Contributions to the DFDL Workgroup's email discussions are
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On Tue, May 24, 2016 at 11:04 AM, Steve Hanson <smh at uk.ibm.com> wrote:

> Mike
>
> I came to write up the issue tracker for this and had a thought.  Property
> textStandardZeroRep says:
>
> *The empty string means that there is no special literal string for zero.
>  *
>
> I wondered if the equivalent is a better interpretation of empty string
> for textStandardNanRep and textStandardInfinityRep ?
>
> Regards
>
> Steve Hanson
> *IBM Integration Bus*
> <http://www-03.ibm.com/software/products/en/ibm-integration-bus>,
> Hursley, UK
> Architect, *IBM DFDL*
> <http://www.ibm.com/developerworks/library/se-dfdl/index.html>
> Co-Chair, *OGF DFDL Working Group* <http://www.ogf.org/dfdl/>
> *smh at uk.ibm.com* <smh at uk.ibm.com>
> tel:+44-1962-815848
> mob:+44-7717-378890
>
>
>
> From:        Steve Hanson/UK/IBM
> To:        Mike Beckerle <mbeckerle.dfdl at gmail.com>
> Cc:        "dfdl-wg at ogf.org" <dfdl-wg at ogf.org>
> Date:        19/05/2016 21:53
> Subject:        Re: [DFDL-WG] clarification: textBooleanTrue/FalseRep
> cannot be empty string? textStandardNaNRep and friends cannot be empty
> string.
> ------------------------------
>
>
> Agree that textBooleanxxxRep properties should state empty string not
> allowed.
>
> The textStandardNanRep and textStandardInfinityRep properties should state
> empty string not allowed. The others you list already mention empty string.
>
> Regards
>
> Steve Hanson
> *IBM Integration Bus*
> <http://www-03.ibm.com/software/products/en/ibm-integration-bus>,
> Hursley, UK
> Architect, *IBM DFDL*
> <http://www.ibm.com/developerworks/library/se-dfdl/index.html>
> Co-Chair, *OGF DFDL Working Group* <http://www.ogf.org/dfdl/>
> *smh at uk.ibm.com* <smh at uk.ibm.com>
> tel:+44-1962-815848
> mob:+44-7717-378890
>
>
>
>
> From:        Mike Beckerle <mbeckerle.dfdl at gmail.com>
> To:        "dfdl-wg at ogf.org" <dfdl-wg at ogf.org>
> Date:        19/05/2016 17:38
> Subject:        [DFDL-WG] clarification: textBooleanTrue/FalseRep cannot
> be empty string? textStandardNaNRep and friends cannot be empty string.
> Sent by:        "dfdl-wg" <dfdl-wg-bounces at ogf.org>
> ------------------------------
>
>
>
>
> We don't stipulate that textBooleanTrueRep nor textBooleanFalseRep cannot
> be empty string.
>
> We do stipulate that entity ES is not allowed. So I expect these
> properties cannot be "" meaning the same thing that "%ES;" would mean.
> Since we disallow the latter, we should disallow just "".
>
> Similarly, for textStandardGroupingSeparator, textStandardExponentRep,
> textStandardNaNRep, and textStandardInfinityRep we specify that the string
> literal value behaves as specified in textStandardDecimalSeparator, but we
> don't specify that these cannot be empty string (which is specified in
> textStandardDecimalSeparator, but not in the "Text Number Character
> Restrictions" part of that property description that is referenced from
> these other properties.)
>
> ES and WSP* are not allowed, so almost certainly empty string should not
> be allowed.
>
>
>
>
> Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
> *www.tresys.com* <http://www.tresys.com/>
> Please note: Contributions to the DFDL Workgroup's email discussions are
> subject to the *OGF Intellectual Property Policy*
> <http://www.ogf.org/About/abt_policies.php>
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>
> Unless stated otherwise above:
> IBM United Kingdom Limited - Registered in England and Wales with number
> 741598.
> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
>
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