[DFDL-WG] dfdl:extraEscapedCharacters - should be able to be expression

[Mike Beckerle]

A user has noticed that for DFDL escape schemes based on escape characters,
the properties dfdl:escapeCharacter and dfdl:escapeEscapeCharacter can both
be runtime-valued expressions, but not dfdl:extraEscapedCharacters.

This is not consistent. A major motivation for having these properties be
runtime expressions is EDI formats, and the example motivating the need for
dfdl:extraEscapedCharacters to be an expression also comes from EDIFACT.

See this Daffodil ticket with a link to the email thread discussing this:
https://issues.apache.org/jira/browse/DAFFODIL-2876

Mike Beckerle
Apache Daffodil PMC | daffodil.apache.org
OGF DFDL Workgroup Co-Chair | www.ogf.org/ogf/doku.php/standards/dfdl/dfdl
Owl Cyber Defense | www.owlcyberdefense.com
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