Jonathan
I've copied Andy who added regexs support
into IBM DFDL recently. He might have an idea as to the effort involved
in stating conformance.
We will discuss your other two emails
on next DFDL-WG call or so.
Regards
Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF
DFDL Working Group
IBM SWG, Hursley, UK
smh@uk.ibm.com
tel:+44-1962-815848
From:
"Cranford, Jonathan
W." <jcranford@mitre.org>
To:
"dfdl-wg@ogf.org"
<dfdl-wg@ogf.org>,
Date:
06/07/2013 00:56
Subject:
Re: [DFDL-WG]
DFDL regular expressions and Unicode
Sent by:
dfdl-wg-bounces@ogf.org
Update: I just found errata 3.29, which answers this
question, I think.
>From the description in the errata, and looking at the documentation for
java 7 regular expressions, it looks like DFDL regular expressions conform
to level 1 of Unicode Regular expressions (UTS#18).
I still think there would be value in stating such conformance in the DFDL
spec, but I suppose that would take some legwork for someone to actually
confirm the conformance of ICU and Java7 to level 1.
Very respectfully,
-- Jonathan Cranford
>-----Original Message-----
>From: Cranford, Jonathan W.
>Sent: Friday, July 05, 2013 1:36 PM
>To: dfdl-wg@ogf.org
>Subject: DFDL regular expressions and Unicode
>
>I've been going through the spec recently, and I have a few questions
about DFDL
>regular expressions.
>
>Rather than put them into one long email, I'll break them up into separate
emails.
>
>First question: What level of conformance to Unicode Technical
Standard #18
>UNICODE
> REGULAR EXPRESSIONS do DFDL regular expressions claim?
>
> For example,
> * XML Schema regular expressions are "targeted at
support of 'Level 1'
>features"
> (http://www.w3.org/TR/xmlschema-2/#dt-ccesN)
> * Java 1.4 regular expressions "implement its second
level of support"
> (http://docs.oracle.com/javase/1.4.2/docs/api/java/util/regex/Pattern.html)
> * Perl 5.18 seems to implement most of Level 1
> (http://perldoc.perl.org/perlunicode.html#Unicode-Regular-Expression-
>Support-Level)
>
> I think the conformance level should be specified in
the DFDL spec so that it is
>clear to schema
> designers what a regular expression would really match
against. Details
> like case conversion and canonical equivalence make a
difference when
> matching against a Unicode string.
>
>Thanks in advance,
>
>--
>Jonathan W. Cranford <jcranford@mitre.org>
>Senior Information Systems Engineer
>The MITRE Corporation (http://www.mitre.org)
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