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https://issues.apache.org/jira/browse/DAFFODIL-1919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16578587#comment-16578587
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Michael Beckerle commented on DAFFODIL-1919:
--------------------------------------------
Part 1 of this effort is complete. New architecture/refactoring of sequences
with/without separators is in place, and behavior is equivalent to the prior
Daffodil behavior.
Part 2 of this effort will be changing the behavior to match what is specified
in the DFDL Spec, as clarified by recent (August 2018) DFDL Workgroup
discussions/email/trackers/errata.
> Trailing Separator Suppression
> ------------------------------
>
> Key: DAFFODIL-1919
> URL: https://issues.apache.org/jira/browse/DAFFODIL-1919
> Project: Daffodil
> Issue Type: Bug
> Components: DFDL Language
> Affects Versions: 2.0.0
> Reporter: Josh Adams
> Assignee: Michael Beckerle
> Priority: Major
> Fix For: 2.2.0
>
>
> Working with Mike on getting the IBMTLOG schema project working, we have come
> to the conclusion that Daffodil's compiler and runtime cannot correctly
> support trailing suppression without some major refactoring.
> We can currently support separatorSuppresssionPolicy always or never, but
> trailing suppression requires backtracking that will need its own iterative
> combinators.
> Pull request 55 (which should be pushed upstream soon after the creation of
> this ticket) includes a couple tests that demonstrate what works and doesn't
> work with our current implementation. I believe that we can currently
> support trailing suppression for required elements, but for optional
> separated elements things break down when the first element of a sequence is
> optional and missing. See
> org.apache.daffodil.section13.packed.TestPacked.testDelimitedIBM4690IntOptSeq02
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