This repository contains the working draft of RealEstateCore version 5, the next-generation ontology for modeling real estate and building data.
REC 5 represents a significant architectural shift:
- OWL/SHACL hybrid model — Combines OWL reasoning capabilities with SHACL validation constraints, replacing the previous DTDL-based approach
- Clean domain separation — REC now focuses purely on real estate entities (spaces, assets, agents, collections), while ICT equipment and telemetry capabilities have migrated to Brick Schema
- Universal entity architecture — All REC concepts inherit from a single
rec:Entityroot class - Brick integration — REC assets connect to Brick measurement points via
rec:hasPoint, enabling rich sensor and equipment modeling without duplication - Multilingual support — Full Swedish translations alongside English labels
REC 5 introduces breaking changes from previous versions, including:
- Complete removal of ICT equipment hierarchy (21 classes migrated to Brick)
- Observation event restructuring (specific observation types replaced by generic events + Brick Points)
- Custom properties exclusion (use external SHACL extensions instead)
See docs/rec5-breaking-changes.pdf for the full migration guide.
ontology/
rec-ontology-configured.ttl # Generated REC 5 ontology (OWL/SHACL)
src/
... # Translation scripts (DTDL → OWL/SHACL)
docs/
ontology-principles.pdf # Translation methodology and design decisions
rec5-breaking-changes.pdf # Breaking changes and migration guide
| Document | Description |
|---|---|
| Ontology Principles | Semantic principles, translation methodology, and configuration decisions |
| Breaking Changes | Incompatibilities with previous REC versions and migration paths |
This is a working draft — we actively encourage community input.
→ Please use GitHub Issues to:
- Report problems or inconsistencies
- Suggest improvements to the model
- Discuss design decisions
- Propose new concepts or relationships
Your feedback helps shape the future of RealEstateCore.
- RealEstateCore — Main REC website
- Brick Schema — Partner ontology for equipment and telemetry
- REC Consortium — Governance and membership
This project is licensed under the BSD 3-Clause License.
This repository is maintained by the REC Consortium.