problem with odrl:target shape

[VladimirAlexiev]

• https://github.com/International-Data-Spaces-Association/ids-specification/blob/main/common/shape/odrl-shapes.ttl#L35 says that odrl:target should be a literal with datatype xsd:anyURI.
• This would make it impossible for odrl:target to point to the asset (dcat:Dataset) in the same JSONLD response.
• In https://w3id.org/dspace/2024/1/context.json it's correctly defined as a URL (@id)
• https://docs.internationaldataspaces.org/ids-knowledgebase/dataspace-protocol/catalog/catalog.protocol#id-1.1-dcat-vocabulary-mapping states

Offers must NOT contain any explicit target attributes. The target of an Offer is the associated Dataset. (through hasPolicy)

• The JSON schema https://eclipse-dataspace-protocol-base.github.io/DataspaceProtocol/2024-1/negotiation/message/schema/contract-schema.json#/definitions/Offer:

not: {required: ["odrl:target"]}

• But the EDC and Sovity implementations include odrl:target, see
  • https://github.com/underpin-project/model/blob/main/dcat#dataspace-catalog-response
  • problems with JSONLD response sovity/edc-ce#1077
• So the SHACL should forbid it, or define it as object prop with range Dataset
• And the JSONLD context should omit it