CELINE Ontology

Semantic artifacts and mapping tools for the CELINE project, supporting:

• semantic interoperability across datasets
• Digital Twins (WP3)
• Demonstrators, KPIs, and evaluation (WP5)
• mapping from tabular data to RDF / JSON-LD

The CELINE ontology is a unified ontology profile — not a standalone domain ontology — that connects PECO, SAREF, SOSA/SSN into a coherent semantic target for the CELINE ecosystem. Since v0.5, KPI semantics are defined natively via a generic KPIDefinition / KPICatalog layer, with alignment to external vocabularies expressed through SKOS annotations rather than OWL imports.

Namespace: https://w3id.org/celine-eu#

Documentation: https://celine-eu.github.io/ontologies/

Repository structure

specs/          Ontology source artifacts (versioned)
  current/      → latest version (v0.5)
  v0.5/
    celine.ttl           OWL/RDF definition (Turtle)
    celine.shacl.ttl     SHACL validation shapes
    celine.jsonld        JSON-LD context
    celine.schema.json   JSON Schema for API validation
    examples/            JSON-LD instance data examples

releases/       Generated WIDOCO HTML documentation (versioned)
  current/      → symlink to latest version
  v0.3/         index-en.html + supporting assets

src/            Python package (celine-ontologies)
  celine/
    mapper/     Declarative data→RDF mapping engine
    ontologies/ Ontology management CLI

Ontology artifacts

Python package

# Mapper API only (OutputMapper, CelineGraphBuilder)
pip install celine-ontologies[mapper]

# Ontology management CLI (fetch, analyze, tree)
pip install celine-ontologies[cli]

# Everything
pip install celine-ontologies[all]

Mapper usage

from pathlib import Path
from celine.mapper import OutputMapper

mapper = OutputMapper.from_yaml_path(
    Path("src/celine/mapper/specs/obs_rec_energy.yaml"),
    context={"community_key": "it-folgaria"},
)
nodes = mapper.map_many(rows)

CLI

# Validate a mapping spec
celine-ontologies mapper validate-spec path/to/spec.yaml

# Map data to JSON-LD
celine-ontologies mapper map spec.yaml input.json

# Map + SHACL validation (requires [mapper])
celine-ontologies mapper shacl-check spec.yaml input.json

# Ontology utilities
celine-ontologies fetch
celine-ontologies analyze
celine-ontologies tree

How the semantic stack fits together

Tabular data
  ↓  mapping spec (YAML)
JSON-LD  ←  celine.jsonld context
  ↓  celine.schema.json
JSON Schema validation
  ↓  RDF expansion
SHACL validation  ←  celine.shacl.ttl
  ↓
CELINE Knowledge Graph / Digital Twin

Releasing a new version

# 1. Add specs/vX.X/ with the new ontology artifacts

# 2. Update the specs/current symlink and tag
task release:ontology

# 3. Generate WIDOCO HTML docs locally (requires Docker)
task docs:widoco           # latest version
task docs:widoco -- vX.X  # specific version

WIDOCO docs are also generated automatically in CI on every push that changes a specs/v*/celine.ttl.

Design principles

• Standards first: reuse ETSI SAREF, W3C SOSA/SSN, PECO for domain semantics
• Alignment via SKOS: external KPI vocabularies (BIGG, SAREF4CITY) are referenced through skos:closeMatch / skos:relatedMatch annotations, not OWL imports
• Thin CELINE layer: only project-specific glue concepts are defined here
• Modular & versionable: specs/ and releases/ evolve independently
• Tool-friendly: compatible with rdflib, JSON-LD processors, SHACL engines