We could do this. It does feel inconsistent that escapeCharacter and
escapeEscapeCharacter are dynamic, but extraEscapedCharacters is not.
I think the design principle at work here was that things associated with
escape characters need to be dynamic, but other kinds of escape
schemes involving escape block start/end, are not.
The extraEscapedCharacter property was a late addition to the DFDL spec.,
so didn't get the scrutiny to notice this need I think.
Is the EDI example you provided a real one? Can you give example data that
shows the need?
If you didn't have this, is there any sensible work around?
I will send this over to the DFDL Workgroup mailing list as well to discuss
the DFDL spec amendment you are suggesting.
In anticipation of this, what are some error situations. E.g., I expect
it's a Schema Definition Error if
* any of the extraEscapedCharacters are the same as the escape or
escapeEscape character
* are the same as the first character of any delimiter in scope
* are not unique
Daffodil is, of course, open-source so if you want this feature you can
have it. I think it would not be terribly hard to add this to daffodil, as
one would just look at how escapeCharacter works, and copy that same idea
for extraEscapedCharacters.
On Fri, Feb 16, 2024 at 2:40 AM Claude Mamo <claude.m...@gmail.com> wrote:
> Dear community,
>
> Is there a way to set *extraEscapedCharacters* in *escapeScheme*
> dynamically like so:
>
> <dfdl:defineEscapeScheme name="EDIEscapeScheme">
> <dfdl:escapeScheme escapeKind="escapeCharacter"
> escapeCharacter="{$ibmEdiFmt:EscapeChar}"
> escapeEscapeCharacter="{$ibmEdiFmt:EscapeChar}"
> extraEscapedCharacters="{$ibmEdiFmt:extraEscapedCharacters}"/>
> </dfdl:defineEscapeScheme>
>
> My understanding is that it doesn't accept DFDL expressions and when I
> attempt to reference a variable I get:
>
> Schema Definition Error: For property dfdl:extraEscapedCharacters the
>> length of string must be exactly 1 character
>
>
> Perhaps support for DFDL expressions can be added to the DFDL spec?
>
> Claude
>
>
