[DFDL-WG] ES in delimiters

[Steve Hanson]

On the face of it, yes it does seem inconsistent. The point being that 
"%WSP*;" is the same as "%ES; %WSP+;" (on parsing, longest match is taken; 
on unparsing nothing is output).

In our NACHA xsds we have:

                        <dfdl:defineFormat name="NACHARecord">
                          <dfdl:format lengthKind="explicit" length="94" 
terminator="%WSP*;"/>
                        </dfdl:defineFormat>

But strictly speaking it should be this because it's an optional new line 
that appears rather than any white space:

                        <dfdl:defineFormat name="NACHARecord">
                          <dfdl:format lengthKind="explicit" length="94" 
terminator="%ES; %NL;"/>
                        </dfdl:defineFormat>

If we allow ES then ES on its own as the only string literal in the list 
should be an error.

Regards
 
Steve Hanson
Architect, IBM 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" <dfdl-wg at ogf.org>, 
Date:   26/06/2014 18:17
Subject:        [DFDL-WG] ES in delimiters
Sent by:        dfdl-wg-bounces at ogf.org



Steve Lawrence from the Daffodil project has observed that we're not 
particularly consistent about delimiters and the %ES; entity. 

We allow WSP* with caveat that you can't have initiatedContent, but we 
disallow ES.

There is a use case for optional delimiters e.g.,

initator="%CR;%LF; %ES;" 

meaning absorb and discard an optional CRLF.

Without %ES we end up having to model this syntax as an optional hidden 
element.

Thoughts?

...mikeb

Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | 
www.tresys.com
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