Skip to content

XwkOnt Core Ontology Release Notes

Milestone: First core ontology publication package — ontology-core-v0.1.0
Date: 2026-07-01 (package assembled); 2026-07-03 (tagged)
Status: Tagged and live; immutable versioned ontology document IRIs remain deferred

Summary

This milestone packages the current XwkOnt core ontology scaffold for first publication-oriented review. It consolidates the core ontology, glossary, axiom, validation, governance, and publication-operations work into a navigable release package and operational pre-tag posture.

XwkOnt remains a crosswalk project, not a new foundational ontology.

Included Artifacts

  • Core ontology specification: docs/ontology/core-ontology.md
  • Closed glossary: docs/ontology/core-glossary.md
  • Conservative axiom notes: docs/ontology/core-axioms.md
  • Competency questions: docs/ontology/core-competency-questions.md
  • Validation report: docs/ontology/core-validation.md
  • Diagram sources: docs/ontology/core-ontology.mmd, docs/ontology/core-glossary-dependencies.mmd
  • Turtle vocabulary companion: data/ontology/core.ttl
  • Illustrative validation examples: data/ontology/examples/core-validation-example.ttl
  • Publication guide: docs/publication/core-publication-guide.md
  • URI/IRI policy: docs/publication/uri-iri-policy.md
  • Publication validation commands: docs/publication/validation-commands.md
  • Publication operations guide: docs/publication/publication-operations.md
  • Redirect/content-negotiation policy: docs/publication/redirects-content-negotiation.md
  • Release tagging checklist: docs/publication/release-tagging-checklist.md

Namespace Posture

The milestone adopts the target public namespace:

https://w3id.org/xwkont/core#

Illustrative examples use:

https://w3id.org/xwkont/examples/core-validation#

ontology-core-v0.1.0 satisfies most of the immutable-versioned-IRI prerequisites in docs/governance/release-versioning-policy.md (release tag, matching artifact bundle, current-namespace redirect and content-negotiation, validation results). It does not yet satisfy the prerequisite that a w3id.org redirect exist for the versioned document path itself: https://w3id.org/xwkont/ontology/core/0.1.0 currently returns 404 (checked 2026-07-03), since only the current-namespace redirects (perma-id/w3id.org#6277, #6292) have been submitted so far. Activating immutable versioned IRIs therefore remains deferred — filing and waiting on a third w3id PR is explicitly not planned for this session, immediately after #6292 merged.

External w3id Submission Status

Two external w3id change requests were submitted and merged:

  • perma-id/w3id.org#6277 ("Add xwkont namespace"), merged 2026-07-02, adding xwkont/.htaccess with a temporary (302) redirect from https://w3id.org/xwkont to https://github.com/xwkont. Verified live 2026-07-02 with a real curl (302 to https://github.com/xwkont).
  • perma-id/w3id.org#6292 ("Add xwkont /core content-negotiation redirect"), merged 2026-07-03, adding content-negotiation rules for https://w3id.org/xwkont/core.

The public xwkont/xwkont repository is live and populated as a curated export of this repository (see docs/publication/public-repository-curation-plan.md). Both redirect paths are now verified deployed — see Content-Negotiation Verification below.

Content-Negotiation Verification

Verified 2026-07-03 with live curl checks against the deployed w3id redirect (perma-id/w3id.org#6292, merged 2026-07-03T12:24:50Z):

  • curl -sI -L "https://w3id.org/xwkont/core" (default Accept) → 302 → https://github.com/xwkont/xwkont/blob/main/docs/ontology/core-ontology.md (human-readable documentation), final response 200.
  • curl -sI -L -H "Accept: text/turtle" "https://w3id.org/xwkont/core" → 302 → https://raw.githubusercontent.com/xwkont/xwkont/main/data/ontology/core.ttl (Turtle vocabulary), final response 200.

Both retrieval paths behave as specified in docs/publication/redirects-content-negotiation.md.

Re-verified 2026-07-08, after core.ttl grew from 21 to 30 classes across the 0.2.0/0.3.0 batches — checking whether the deployed redirect still served current content, not just whether it still redirected: both retrieval paths returned the same 302/final-200 behavior as 2026-07-03, the fragment IRI https://w3id.org/xwkont/core#Entity resolves via the same namespace-document redirect, and the served Turtle body's class count matches data/ontology/core.ttl's local count (30) exactly — confirming the deployment reflects current content, not a stale cache. https://w3id.org/xwkont/ontology/core/0.1.0 still returns 404, unchanged from this milestone's original deferral of immutable versioned IRIs. See docs/publication/redirects-content-negotiation.md's Verification Result section for the full command output.

Validation Posture

Publication-time validation is intentionally minimal:

  • Check repository cleanliness before final publication.
  • Parse Turtle files with RDFLib when available.
  • Run a dependency-free structural fallback check when RDFLib is unavailable.
  • Confirm required publication artifacts exist.

No OWL reasoner is required for this milestone.

Known Limitations

  • No source-ontology correspondences are introduced.
  • Example data is illustrative and non-authoritative.
  • xwkont-core:mapsTo remains transitional and has no RDFS domain or range.
  • Full mapping-record guidance and SKOS mapping-property usage guidance are deferred.
  • Process/Event boundaries remain unresolved.
  • Dependency subtypes remain unresolved.
  • Inverse-property, disjointness, cardinality, transitivity, and other property-characteristic axioms remain deferred.
  • Versioned release distribution files are not created as part of this milestone.
  • Immutable versioned ontology document IRIs (https://w3id.org/xwkont/ontology/core/0.1.0) are not yet active — no w3id redirect exists for that path.

Compatibility Notes

The Turtle namespace changed from the earlier placeholder https://example.org/xwkont/ base to the target public https://w3id.org/xwkont/ base. This is a publication preparation change, not a source-ontology semantic change.

Follow-Up

ontology-core-v0.1.0 is tagged and pushed to both the private and public repositories. All release-tagging-checklist items are complete — see docs/publication/release-tagging-checklist.md.

Remaining, deferred (not scheduled for this session):

  1. Decide whether to submit a third w3id PR adding a redirect for the versioned document path (https://w3id.org/xwkont/ontology/core/0.1.0) — the last unmet prerequisite for activating immutable versioned ontology document IRIs per docs/governance/release-versioning-policy.md.