Bidirectional OO-LD <-> SAMM converter

[SimonStier]

Convert between OO-LD schemas and SAMM aspect models (Eclipse Semantic Modeling Framework).

Spec-side siblings: OO-LD/oold-schema#119 (generating OO-LD schemas from an existing source model) and OO-LD/oold-schema#107 (QuantityValue as a base building block).

Mapping

• Aspect to the top-level object schema, Entity to nested object schemas, Property to schema properties
• SAMM is RDF/Turtle based, so the OO-LD @context is the natural source and target for the IRIs

SAMM Characteristics overlap substantially with existing concepts in world.opensemantic.core, which should be reused rather than re-invented:

• Characteristic, the elementary building block for object data schemas, which can inherit, reuse or define properties from other Characteristics
• CharacteristicType, a set of properties intended for use in other characteristic types or classes
• QuantityValue (value, unit) and QuantityValueType (quantity, default_unit), which cover the SAMM Quantifiable and Unit cases

Open questions

• How far the SAMM Characteristic model and the OSW Characteristic / CharacteristicType model actually align, and where they diverge
• Which Characteristics and Constraints have no JSON Schema counterpart, and what happens to them
• Overlap with the AAS submodel converter: AAS submodel templates can be generated from SAMM, so decide whether to chain through SAMM or convert independently
• Which SAMM version to target