python-schema-salad 2.6.20171201034858-3 (amd64 binary) in ubuntu bionic

 Salad is a schema language for describing JSON or YAML structured linked data
 documents. Salad is based originally on JSON-LD and the Apache Avro data
 serialization system.
 .
 Salad schema describes rules for preprocessing, structural validation, and
 link checking for documents described by a Salad schema. Salad features for
 rich data modeling such as inheritance, template specialization, object
 identifiers, object references, documentation generation, and transformation
 to RDF. Salad provides a bridge between document and record oriented data
 modeling and the Semantic Web.