Hot Fix 0.3.1

[benoitcayladbx]

OntoBricks — Release Notes V3.3.1

Release window: May 2026
Type: Hotfix
Test status: 141 cohort tests passed, 0 failed (49 test_cohort_builder.py, 31 test_dtwin_cohort.py, 34 test_cohort_models.py, 24 test_agent_cohort_tools.py, 3 test_agent_cohort_engine.py).

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Highlights

• Cohort Discovery: predicate namespace fix — hasClaim (and any predicate loaded outside R2RML) now resolves correctly. The engine no longer silently misses triples whose predicate is in ontology-namespace form (#) when the lookup key is in data-namespace form (/).
• Cohort Discovery: cross-namespace predicate fallback — CohortBuilder gains a local-name alias map mirroring the SparqlTranslator approach, so predicates from a completely foreign namespace (e.g. ontobricks.com/ontology#hasclaim vs. databricks-ontology.com/Cust360Auto/hasclaim) resolve via local-name matching.
• Cohort designer UX — attribute dropdowns in the Path "where" filter and the Compatibility section are now scoped to the entity being filtered, not the full ontology property list.

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Cohort Discovery — Bug Fixes

Fix 1: ontology-form predicate silent miss (CohortBuilder._outgoing_edge_index)

When data triples were inserted outside the R2RML pipeline (direct insert, W3C OWL round-trip, manual load), their predicates were stored in ontology-namespace form (…#hasClaim) while the lookup key produced by _normalized_links was in data-namespace form (…/hasClaim). This caused a silent neighbours_raw = 0 and an empty cohort.

Changes:

• src/back/core/graph_analysis/CohortBuilder.py — _outgoing_edge_index promoted from @staticmethod to instance method so it can call self._to_data_uri(pred). Every triple predicate is now normalised to data-namespace form when the index is built.
• src/front/static/query/js/query-cohorts.js — _renderTraceLink now guards on in_frontier === 0 before neighbours_raw === 0. When the starting frontier is empty the diagnostic message now reads "the starting frontier for this hop is empty — all members were eliminated before reaching it. Check the compatibility (Stage 3a) filters or the previous hop's target_class." instead of misleadingly blaming the predicate URI.
• tests/test_cohort_builder.py — 2 new tests: test_data_with_ontology_form_predicate_is_indexed_correctly, test_trace_shows_nonzero_raw_for_ontology_form_predicate.

Fix 2: cross-namespace predicate — local-name alias fallback

_to_data_uri can only bridge # ↔ / within the same base namespace. When the domain's object property URIs live in a completely different namespace (e.g. inherited shared namespace ontobricks.com/ontology#) the first fix was not sufficient.

Changes:

• src/back/core/graph_analysis/CohortBuilder.py:
  • _predicate_alias_map() — scans loaded triples, builds {local_name → canonical_data_namespace_uri}, cached in self._cache["predicate_alias"] and invalidated on triple reload.
  • _resolve_predicate(uri) — tries _to_data_uri first; if the URI is unchanged (foreign namespace) falls back to the alias map by local name.
  • _normalized_links and _normalized_compat updated to use _resolve_predicate instead of _to_data_uri.
• tests/test_cohort_builder.py — 1 new test: test_via_from_foreign_namespace_resolved_by_local_name (exact replica of the ElectricitySuspended / Cust360Auto production scenario).

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Cohort Designer — UX

Attribute dropdowns scoped to entity

Property dropdowns in the Path "where" filter and the Compatibility section previously listed every property in the ontology regardless of the entity in scope. Users had to scroll through unrelated properties when filtering a specific hop.

Changes:

• src/front/static/query/js/query-cohorts.js:
  • New _dataPropsForClass(classUri) helper — filters to data properties whose domain matches the class, with a full-list fallback when ontology metadata is incomplete.
  • _renderHopWhereRow now calls _dataPropsForClass(targetClassUri).
  • _renderCompat now calls _dataPropsForClass(this.rule.class_uri).

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Modified files

File	Change
src/back/core/graph_analysis/CohortBuilder.py	Predicate normalisation fixes + alias map
src/front/static/query/js/query-cohorts.js	Diagnostic guard + scoped attribute dropdowns
tests/test_cohort_builder.py	3 new regression tests

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Upgrade notes

No schema, API, or configuration changes. Drop-in replacement for v3.3.0.
If a cohort was returning empty results due to the hasClaim predicate mismatch, re-run Materialise — no manual data migration required.

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This discussion was created from the release Hot Fix 0.3.1.