[DFDL-WG] clarification needed on lengthKind='pattern' inside complexType element with lengthKind='delimited'
Steve Hanson
smh at uk.ibm.com
Wed Oct 24 15:31:10 EDT 2012
Mike
The latest internal draft of the spec says:
"When dfdl:lengthKind is 'pattern', it means that delimiter scanning is
turned off and in-scope delimiters are not looked for within or between
elements."
This is from errata 3.3:
"3.3. Section 12.3. Clarify that when property is lengthKind 'explicit',
'implicit' (simple only), 'prefixed' or 'pattern', it means that delimiter
scanning is turned off and in-scope delimiters are not looked for within
or between elements."
Regards
Steve Hanson
Architect, 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: 24/10/2012 20:16
Subject: [DFDL-WG] clarification needed on lengthKind='pattern'
inside complexType element with lengthKind='delimited'
Sent by: dfdl-wg-bounces at ogf.org
If I nest an element having lengthKind='pattern' inside a complexType
element with lengthKind='delimited' I wanted to clarify the behavior of
the pattern matching.
I've been assuming the pattern does NOT get stopped by occurrances of the
delimiters. That is, the pattern scan is in no way adapted to being inside
of a delimited context.
The alternative would be that the lengthKind="pattern" element's pattern
would be augmented by something allowing it to stop if the delimiter were
encountered, possibly taking even escape schemes into account, etc.
This does not seem worth it to me. It seems like the behavior for
lengthKind='pattern' should be greedy, and blind to enclosing delimiters.
Precedent is that lengthKind="explcit" is also blind to enclosing
delimiters.
Comments?
--
Mike Beckerle | OGF DFDL WG Co-Chair
Tel: 781-330-0412
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