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https://issues.apache.org/jira/browse/OPENNLP-1868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Wiesner resolved OPENNLP-1868.
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Resolution: Delivered
> Support bundled full case-folding with provenance and audit
> -----------------------------------------------------------
>
> Key: OPENNLP-1868
> URL: https://issues.apache.org/jira/browse/OPENNLP-1868
> Project: OpenNLP
> Issue Type: Task
> Components: dl, Sentiment Detection
> Affects Versions: 3.0.0-M4
> Reporter: Kristian Rickert
> Assignee: Kristian Rickert
> Priority: Major
> Fix For: 3.0.0-M5
>
> Time Spent: 3h 50m
> Remaining Estimate: 0h
>
> Part 2 of 4 for the Epic OPENNLP-1852
> *Stacks on:* OPENNLP-1867.
> *Summary.* Add a bundled case-folding table sourced from Unicode
> \{{CaseFolding.txt}} (status C common and F full, including the expanding
> folds such as eszett to ss and ligature ff to ff), exposed as an offset-aware
> fold rung. Because the table is authored with known source and target
> lengths, the rung builds its \{{Alignment}} during the pass, so full case
> folding is offset-safe without ICU4J. Carry provenance metadata per row
> (\{{UTS21:CaseFolding:<status>}}).
> *Acceptance criteria.*
> * An offset-aware full-case-fold rung backed by the bundled table, opt-in
> (not a default).
> * A build/test completeness audit that fails on drift or gaps versus upstream
> \{{CaseFolding.txt}} (every C and F row present and identical).
> * Round-trip tests for representative expanding folds (eszett, ligatures)
> through the pipeline.
> * Bundled data carries LICENSE/NOTICE/rat-excludes, same discipline as the
> 1850 Unicode data files.
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