bcf-shapes

This repository contains the SHACL conformance profile for bcfOWL 1.0.0(https://w3id.org/bcfOWL#).

bcfOWL states no cardinality restrictions. Under the open-world assumption, OWL infers instead of checking. A Topic without a title does not violate owl:minCardinality 1. The shapes check the BCF structure of a dataset under the closed-world assumption, for example:

• a Project has exactly one identifier, title, and reference space;
• a Topic has exactly one title and at most one status, and it belongs to exactly one Project;
• each type, status, label, priority, and stage value of a Topic is a member of the matching scheme of the project;
• each creator, assignee, and last editor is a user of the project;
• a Viewpoint has exactly one camera projection;
• a Comment belongs to exactly one Topic, in the same project as the Topic.

The shapes target only the BCF coordination layer. A photograph, its capture (sosa:Observation), or its media is not constrained until a Viewpoint refers to it.

• Shapes: shapes/bcf-shapes.ttl
• Shapes namespace: https://github.com/Design-Computation-RWTH/bcf-shapes# (prefix bcfsh)
• Test data: test-data/

Use the shapes

Give the validator shapes/bcf-shapes.ttl and the bcfOWL ontology as the shapes graph, and your data as the data graph. The validator must support the SHACL-SPARQL extension. Without it, the checks of the controlled vocabularies and of the project consistency do not run.

Provenance and RDF 1.2

The test data valid-provenance.ttl records the change history of a Topic with RDF 1.2 triple terms. The shapes do not check this history yet.

SHACL Core can check a reifier, because a reifier is a usual node. SHACL Core cannot read the statement inside a triple term. A SHACL-SPARQL rule can read it, but only if the SPARQL engine supports SPARQL 1.2. Support for this differs between validators, and it is not verified yet.

Run the tests

You need Node.js 22 or later.

npm install
npm test

The tests make sure that each valid-*.ttl file in test-data/ conforms alone, and that each file in test-data/invalid/ fails for its one rule.

The tests use a copy of the ontology in tests/support/bcfOWL.ttl.

Licenses

• Shapes and test data: CC BY 4.0
• Test code: MIT

Author

Oliver Schulz, Design Computation, RWTH Aachen University