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https://issues.apache.org/jira/browse/DAFFODIL-2278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17114380#comment-17114380
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Mike Beckerle commented on DAFFODIL-2278:
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These schemas have discriminators:
(note: not all of these are publicly available)
In some cases this usage may be perfectly reasonable. But where backtracking
can be avoided entirely using a dispatch, that is always preferable and is in
fact more declarative than a bunch of discriminators which have to be inferred
to be using the same mechanism in order to detect uniformity in the schema.
JPEG
IPFIX
BMP
icalendar
imf-icalendar-cse
jpeg2000
PNG
link16
mil-std-2045
vmf
vmf_s2s
nact
uscg_ucop_lh
stanag-5516 (unclear which of several schemas there. Only the "fast one" needs
to worry about this.)
jreap
gif
NITF
SHP
That's a shorter list than I expected.
> Rewrite example schemas to use choiceDispatchKey, not discriminators
> --------------------------------------------------------------------
>
> Key: DAFFODIL-2278
> URL: https://issues.apache.org/jira/browse/DAFFODIL-2278
> Project: Daffodil
> Issue Type: Bug
> Components: Usability
> Affects Versions: 2.5.0
> Reporter: Mike Beckerle
> Priority: Major
> Fix For: 3.0.0
>
>
> Lots of example schemas are written using discriminators, because they
> predated the choiceDispatchKey feature.
> These schemas should be revised to use choiceDispatchKey, which is a tighter
> more declarative specification of a format, and also more efficient.
> See issue: [https://github.com/DFDLSchemas/PCAP/issues/4](DONE!) also, which
> is about rewriting discriminators for PCAP specifically
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