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https://issues.apache.org/jira/browse/UIMA-3969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158472#comment-14158472
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Marshall Schor commented on UIMA-3969:
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Some users have expressed an interest in exploiting JSONs capabiliies to have
more embedding (we currently embed lists and arrays as feature values if they
are marked in the type system as
{{<multipleReferencesAllowed>false</multipleReferencesAllowed>}}.
They would like this embedding to include FSs within other FSs (FSs means
FeatureStructures). And they would like this done based on dynamically
determining if the embed candidate is multiply-referenced or not. When I delve
into this, I see some issues with supporting this and delta CAS formats.
One approach is to drop delta CAS formats. I'm wondering if this might be
reasonable, given that we have XMI serialization as an alternative (or various
binary ones). I think the main motivation for JSON serialization is to connect
the output of UIMA pipelines with non-UIMA web or cloud applications; this is
probably a quite different model than the standard UIMA pipeline with remotes
model, where the intent is to send a CAS to a remote, and have it be "returned"
(often as a Delta).
I'd like to hear from anyone listening of your views on this trade-off between
supporting dynamic embeddability and supporting delta-CAS formats.
> Add JSON Serialization for CASs and UIMA Descriptors
> ----------------------------------------------------
>
> Key: UIMA-3969
> URL: https://issues.apache.org/jira/browse/UIMA-3969
> Project: UIMA
> Issue Type: New Feature
> Components: Core Java Framework
> Affects Versions: 2.6.0SDK
> Reporter: Marshall Schor
> Assignee: Marshall Schor
> Priority: Minor
> Fix For: 2.6.1SDK
>
>
> Recent trends toward moving things into the cloud motivated me to consider
> what a JSON serialization of the CAS and descriptor metadata (more
> particularly, type systems) might look like.
> I've put up a Wiki page with some of the thoughts so far in this exploration,
> here:
> https://cwiki.apache.org/confluence/display/UIMA/JSON+serialization+for+UIMA
> I'm also fooling around with a proof-of-concept implementation, based on our
> current XMI serialization for the CAS, as well as our MetaDataObject_impl
> serialization for UIMA descriptors, in order to work out the details. There
> are additional nits (like how to configure things) not yet worked out.
> Comments and discussion appreciated; I've put this up as a Jira to record
> them together - but feel free to use email also for any comments you feel
> might be better being more ephemeral.
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