Policy representation: odr:datatype and odrl:unit in a constraint are not stored, odrl:rightOperand cannot hanlde typed literals

[gkirtzou]

Bug Report

Describe the Bug

Following the ODRL model,

"A Constraint MAY have none or one dataType property value for the data type of the rightOperand/Reference. A Constraint MAY have none or one unit property value (of type IRI [rfc3987]) to set the unit used for the value of the rightOperand/Reference." (source https://www.w3.org/TR/odrl-model/#constraint-class) .

Moreover, odrl:rightOperand again from the ODRL model page

"one rightOperand property value of type: literal, or IRI [rfc3987], or RightOperand; or for set-based operators; list of literals, or list of IRIs [rfc3987], or list of RightOperands; "

Expected Behavior_

• Problem 1: Given a policy with odrl:datatype and/or odrl:unit properties on the constraint, EDC should parse them and store them in the SQL database.
• Problem 2: EDC should handle odrl:rightOperand with typed literals values.

Observed Behavior

• Problem 1: EDC ignores odrl:datatype and/or odrl:unit properties when creating the policy, and does not store them in the db
• Problem 2: EDC ignores typed literal as odrl:rightOperand, and keeps only the @value , and stores it as a simple string.

Steps to Reproduce

During policy creation, the following input is provided to EDC that contains both odrl:datatype and odrl:unit properties
and a typed literal for the odrl:rightOperand property for the constraint:

{
  "@context": {
    "@vocab": "https://w3id.org/edc/v0.0.1/ns/",
    "edc": "https://w3id.org/edc/v0.0.1/ns/",
    "rdfs": "http://www.w3.org/2000/01/rdf-schema#",
    "dcat": "http://www.w3.org/ns/dcat#",
    "xsd": "http://www.w3.org/2001/XMLSchema#",
    "foaf": "http://xmlns.com/foaf/0.1/",
    "rdf": "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
    "adms": "http://www.w3.org/ns/adms#",
    "dcmitype": "http://purl.org/dc/dcmitype/",
    "skos": "http://www.w3.org/2004/02/skos/core#",
    "dct": "http://purl.org/dc/terms/",
    "odrl": "http://www.w3.org/ns/odrl/2/",
    "owl": "http://www.w3.org/2002/07/owl#",
    "cc": "http://creativecommons.org/ns#",
    "dalicc": "https://dalicc.net/ns#",
    "dalicclib": "https://dalicc.net/licenselibrary/",
    "osl": "http://opensource.org/licenses/",
    "prov": "http://www.w3.org/ns/prov#",
    "spdx": "http://spdx.org/rdf/terms#",
    "example": "http://www.example.com/"
  },
  "policy": {
    "@type": "odrl:Set",
    "dct:description": {
      "@language": "en",
      "@value":"Payment Once - odrl:compensate"
    },
    "dct:title": {
      "@language": "en",
      "@value": "Payment Once - odrl:compensate"
    },
    "odrl:permission": [
      {
        "@type": "odrl:Permission",
        "odrl:action": {
          "@id": "odrl:use"
        }
      }
    ],
    "odrl:obligation": [
      {
        "@type": "odrl:Duty",
        "odrl:action":
        {
          "@id": "odrl:compensate"
        },
        "odrl:constraint": [
            {
              "odrl:leftOperand": {
                "@id": "odrl:payAmount"
              },
              "odrl:operator": {
                "@id": "odrl:eq"
              },
              "odrl:rightOperand": {
                "@type": "http://www.w3.org/2001/XMLSchema#decimal",
                "@value": "100.0"
              },
              "odrl:unit": "http://dbpedia.org/resource/Euro",
              "ordl:datatype": "http://www.w3.org/2001/XMLSchema#decimal"
            }
        ]
      }
    ],
    "odrl:prohibition": null
  }
}

The policy was created successfully, but the returned policy from EDC is missing these two properties and only the value of the rightOperand is returned.

{
    "@id": "a2958688-b390-4298-a348-104dda38967a",
    "@type": "PolicyDefinition",
    "createdAt": 1726754527817,
    "policy": {
        "@id": "aeabfcea-98f8-4684-9750-3b9b875f1925",
        "@type": "odrl:Set",
        "odrl:permission": {
            "odrl:action": {
                "@id": "odrl:use"
            }
        },
        "odrl:prohibition": [],
        "odrl:obligation": {
            "odrl:action": {
                "@id": "odrl:compensate"
            },
            "odrl:constraint": {
                "odrl:leftOperand": {
                    "@id": "odrl:payAmount"
                },
                "odrl:operator": {
                    "@id": "odrl:eq"
                },
                "odrl:rightOperand": "100.0"
            }
        }
    },
    "@context": {
        "@vocab": "https://w3id.org/edc/v0.0.1/ns/",
        "edc": "https://w3id.org/edc/v0.0.1/ns/",
        "foaf": "http://xmlns.com/foaf/0.1/",
        "xsd": "http://www.w3.org/2001/XMLSchema#",
        "dcat": "http://www.w3.org/ns/dcat#",
        "rdfs": "http://www.w3.org/2000/01/rdf-schema#",
        "owl": "http://www.w3.org/2002/07/owl#",
        "euvoc_auth": "http://publications.europa.eu/resource/authority/",
        "ms": "http://w3id.org/meta-share/meta-share/",
        "odrl": "http://www.w3.org/ns/odrl/2/",
        "omtd": "http://w3id.org/meta-share/omtd-share/",
        "lds": "https://lds.eu/",
        "schema": "https://schema.org/",
        "dct": "http://purl.org/dc/terms/",
        "iana": "http://www.iana.org/assignments/media-types/application/",
        "skos": "http://www.w3.org/2004/02/skos/core#",
        "dcmitype": "http://purl.org/dc/dcmitype/",
        "loc": "http://id.loc.gov/vocabulary/iso639-1/",
        "adms": "http://www.w3.org/ns/adms#",
        "rdf": "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    }
}

Context Information

Used version EDC v0.8.0

[jimmarino]

Closing based on my comments for #4482.