I think the restriction was aimed at avoiding
things like this:
outputValueCalc="{ if (fn:string-length(../s)
lt 64) then fn:concat(../s, '%#rFF;') else ../s }"
I agree that a total ban is too restrictive.
My personal preference would be for the dfdl:string() function because
it makes the usage of DFDL-specific features obvious in the DFDL expression.
But what would be the return type of dfdl:string()? It it returned a sequence
of characters then the raw byte entity ( %#rnn; ) would still need to be
disallowed.
regards,
Tim Kimber, DFDL Team,
Hursley, UK
Internet: kimbert@uk.ibm.com
Tel. 01962-816742
Internal tel. 37246742
From:
Mike Beckerle <mbeckerle.dfdl@gmail.com>
To:
dfdl-wg@ogf.org,
Date:
04/12/2012 23:36
Subject:
[DFDL-WG] DFDL
character entities in DFDL expressions
Sent by:
dfdl-wg-bounces@ogf.org
We currently have this language in the spec:
"Within an expression, a string is never interpreted as a DFDL string
literal."
To me this means one cannot use DFDL character entities in an expression.
However, I need to do this:
outputValueCalc="{
if (fn:string-length(../s) lt 64) then fn:concat(../s, '%NUL;')
else ../s }"
Basically, I need to append a NUL on the end of the string in the output
value case.
Unless I can put a %NUL; into an expression and have it interpreted as
a DFDL String literal, I am not sure how I can achieve this.
At minimum I need a new DFDL function which might be an alternate string
constructor, such as dfdl:string('....') which interprets the argument
as something where the contents are to be scanned for DFDL character entities
and they are substituted so that the resulting string can contain the characters
that are disallowed in XML. (like NUL)
--
Mike Beckerle | OGF DFDL WG Co-Chair | Tresys Technologies
Tel: 781-330-0412
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