[DFDL-WG] Spec bug: WSP* should not be allowed for textStandardZeroRep

[Steve Hanson]

It also applies to initiator, terminator, separator. The spec descriptions 
of these properties do not say that %ES; is not allowed, but they should 
do - it is not legal for any of these properties to return empty string. 
IBM DFDL checks for this.

We are inconsistent with how entities like %ES; are referred to in the 
spec. Some references use ES and some use %ES;.

Regards

Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848



From:   Mike Beckerle <mbeckerle.dfdl at gmail.com>
To:     Steve Hanson/UK/IBM at IBMGB, 
Cc:     "dfdl-wg at ogf.org" <dfdl-wg at ogf.org>, "dfdl-wg-bounces at ogf.org" 
<dfdl-wg-bounces at ogf.org>
Date:   16/08/2013 19:24
Subject:        Re: [DFDL-WG] Spec bug: WSP* should not be allowed for 
textStandardZeroRep



I can find only one place in the spec where this applies which is 
textStandardZeroRep.

I am updating errata 2.42 with this clarification also. 


On Mon, Aug 12, 2013 at 11:03 AM, Steve Hanson <smh at uk.ibm.com> wrote:
Mike 

%WSP*; is useful tacked onto the end of string literal properties that 
don't allow %ES; so I think the correct restriction is that if a property 
does not allow %ES; it should not allow %WSP*; on its own. 

Regards

Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848 



From:        Mike Beckerle <mbeckerle.dfdl at gmail.com> 
To:        dfdl-wg at ogf.org, 
Date:        10/08/2013 17:02 
Subject:        [DFDL-WG] Spec bug: WSP* should not be allowed for       
 textStandardZeroRep 
Sent by:        dfdl-wg-bounces at ogf.org 




We don't allow %ES; for textStandardZeroRep. But we do allow character 
class entities like %NL; %WSP; %WSP+; and... problematic: %WSP*;

I claim if you don't allow %ES; you should not allow %WSP*; because it 
matches zero-or-more, allowing an empty-string to match in principle. 

Leaving off WSP* only eliminates the zero-characters option, as WSP+ is 
available.

There are probably other places in the spec that have this same issue. 
Basically, anyplace that %ES is disallowed but the other character class 
entities are allowed.



-- 
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | 
www.tresys.com
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IBM United Kingdom Limited - Registered in England and Wales with number 
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-- 
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | 
www.tresys.com


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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