[DFDL-WG] ambiguity - mandatory alignment for text (12.1.2)
Steve Hanson
smh at uk.ibm.com
Wed Sep 11 09:19:29 EDT 2013
Agreed on WG call that there was no contradiction - the first is a rule
about specifying alignment, the second is about skipping to an alignment.
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" <dfdl-wg at ogf.org>,
Date: 09/09/2013 15:59
Subject: [DFDL-WG] ambiguity - mandatory alignment for text
(12.1.2)
Sent by: dfdl-wg-bounces at ogf.org
These two paragraphs contradict each other.
When processing textual data, it is a schema definition error if the
dfdl:alignment and dfdl:alignmentUnits properties are used to specify
alignment that is not a multiple of the encoding-specified mandatory
alignment.
If the data is not aligned to the proper boundary for the encoding when
textual data is processed, then bits are skipped (parsing) or filled from
dfdl:fillByte (unparsing) to achieve the mandatory alignment.
So is it to be SDE (conservative), or just move over to the mandatory
alignment? E.g.,
<xs:sequence dfdl:encoding="utf-8" dfdl:alignment="7"
dfdl:alignmentUnits="bits" dfdl:initiator="hello">....
The alignment property says 7 bits, but the initiator is utf-8 which
requires 8 bits. So we either SDE, or we just add additional alignment
bits to align the initiator text.
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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