agrag.schema.formats.shacl.to_shacl

to_shacl(schema:GraphSchema, *, base_iri:str | None = None) -> str

Export a schema as SHACL shapes in Turtle syntax.

Each entity type becomes a sh:NodeShape with a sh:targetClass, its description as rdfs:comment and each parent as rdfs:subClassOf. Each declared property becomes an inline sh:property shape with sh:path, sh:datatype, sh:minCount and, for enums, sh:in. Each relation type becomes an rdf:Property with its description as rdfs:comment, annotated with its declared patterns and limits, plus one sh:property shape on each endpoint's node shape naming the allowed classes (sh:inversePath on the target side). Endpoint shapes cover every pair GraphSchema.allows accepts, so descendants and symmetric reversals are included. Cardinality limits appear both as sh:maxCount shapes, which validators enforce, and as x-agrag: annotations for pipelines; patterns and symmetry appear only as annotations that validators ignore.

Parameters:

• schema (GraphSchema) – The schema to export.
• base_iri (str | None) – A namespace IRI for the ex: prefix. Defaults to the schema namespace shared with the JSON-LD export.

Returns:

• str – Turtle text describing the schema, written without dependencies.

Raises:

• ValueError – If a property name collides with a relation label, or the base IRI would break the Turtle output.