Mike

23.5.3.1. Value length is only a function of the dfdl:encoding property if the element has a text representation. Not sure this needs to be (re)stated here.

23.5.3.1. "The value length is computed from the DFDL infoset value, ignoring the dfdl:length or dfdl:textOutputMinLength property. Other DFDL properties which affect the length of a text or binary representation are respected, it is only an explicit length which is ignored." Last sentence is too imprecise - should be phrased in terms of the grammar.

23.5.3.1. "If the second argument is 'characters' then the element must have text representation and it is a schema definition error otherwise". Yes but only for a simple type, so should be qualified.

23.5.3.1. "If the second argument, giving the length units, is 'characters', then recursively, this complex type element must have text representation throughout all its contained elements and framing, all of which must also use a uniform character set encoding."  I can't see that restriction elsewhere in the spec when it talks about length of ComplexContent and lengthUnits 'characters' - I was expecting it to be in section 12.3.4 or 12.3.7.3 which face the same issue - but it isn't. Did we decide not to have this restriction? Without such a restriction, how does the unparser come up with a meaningful length (unless it re-parses)? (Tim - what does IBM DFDL do here?)  What about delimiters and padding of children that use %#r entities?

23.5.3.2. The points in 23.5.3.1 about escape characters, length as a function of encoding, and bottom up for complex elements, apply equally to 23.5.3.2.  It might be easier just to say in 23.5.3.2 that dfdl:contentLength for complex elements is same as dfdl:valueLength, and for simple elements differs only by the additional inclusion of LeftPadding and RightPadOrFill regions.

Also noted in passing:

Specified length - An item has specified length when dfdl:lengthKind is "implicit", "explicit", or "prefixed".  

should be

Specified length - An element has specified length when dfdl:lengthKind is "implicit" (simple type only), "explicit", or "prefixed".  

Regards
 
Steve Hanson
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh@uk.ibm.com
tel:+44-1962-815848



From:        Mike Beckerle <mbeckerle.dfdl@gmail.com>
To:        "dfdl-wg@ogf.org" <dfdl-wg@ogf.org>,
Date:        20/03/2014 17:21
Subject:        [DFDL-WG] Action 242 - valueLength and contentLength function        wording
Sent by:        dfdl-wg-bounces@ogf.org

---

See attached doc which is proposed revisions to section 23.5.3

Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | www.tresys.com
Please note: Contributions to the DFDL Workgroup's email discussions are subject to the OGF Intellectual Property Policy
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