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Older-Kolibri Perseus export drops QTI Text entry items whose numeric answers are valid xsd:double but not parseable by extract_value #6224
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- added a parent issue
on Sep 30, 2026 Plan: Text entry items whose answers are valid finite
xsd:doublevalues (+5,1E3) derive a Perseus item that accepts them (issue #6224, targetunstable).- Normalise xsd:double answers in Perseus derivation
- Publish-level coverage of the derived JSON
- Self-review the branch
Assumptions — the issue did not settle these; say so if one is wrong.
- Older-Kolibri Perseus export of QTI Text entry items has no answers when the accepted answers are not numbers #6222 merges first; if not, only
_derive_textnormalisation is built and the gate wiring waits. INF,-INF,NaNstay not derivable; if Perseus should accept them, the template andextract_valueneed a representation.- Overflow (
1e400) is not derivable; if wrong, the item ships an infinite Perseus answer. - Leading
+is stripped only on xsd:double tokens; if+50%or+1/2should derive, the normaliser widens beyond xsd:double.
@rtibblesbot's comments are generated by an LLM, and should be evaluated accordingly
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- Implemented code following the pre-approved plan using test-driven development (red-green-refactor)
- Ran the project's full test suite and linter before committing
- For UI changes: captured live screenshots to verify rendering
- For backend changes: verified with example API/CLI output
- removed a parent issue
on Sep 30, 2026
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Observed behavior
perseus_derivegates Text entry derivation onparser.extract_value, whose grammar is narrower than xsd:double (the Numeric answer format, see #6150).Accepted answers that are valid numbers but return
Nonefromextract_value:+51E3(capitalE)INF,NaNSuch an item is reported not derivable, so the node publishes QTI only. Before #6222 it shipped a Perseus item with
"answers": [].Expected behavior
Valid numeric answers derive a Perseus item that accepts them, e.g. by normalising the value (
+5→5,1E3→1e3) before it reachesPerseusExerciseGenerator._process_input_answers.User-facing consequences
Learners on older Kolibri get no exercise for these nodes.
Steps to reproduce
is_perseus_derivable(_text_item("single", ["+5"]))→False.["1E3"].Context