The vocabulary extends schema.org. Every type is a subclass of a schema.org type, so always state both types (for example ["dbe:BloodSupplyLevel", "Observation"]). Consumers that do not know this vocabulary still read valid schema.org data. Add the prefix to your JSON-LD context:

{
    "@context": [
        "https://schema.org",
        {
            "dbe": "https://www.donateblood.eu/ns/blood#"
        }
    ]
}

Example: a donation centre with the supply level of one blood group. value is the stock level in percent (0-100, unitCode P1), observationDate is the date the source published.

{
    "@context": [
        "https://schema.org",
        {
            "dbe": "https://www.donateblood.eu/ns/blood#"
        }
    ],
    "@type": [
        "MedicalClinic",
        "dbe:BloodDonationCenter"
    ],
    "@id": "https://example.org/centres/123",
    "name": "Blood Transfusion Centre",
    "dbe:bloodBarometer": {
        "@type": [
            "dbe:BloodBarometer",
            "Dataset"
        ],
        "name": "Blood supply barometer",
        "isBasedOn": "https://hospital.example.org/blood-supply",
        "dateModified": "2026-11-06T07:00:00+01:00",
        "dbe:isEstimate": false,
        "dbe:supplyLevel": [
            {
                "@type": [
                    "dbe:BloodSupplyLevel",
                    "Observation"
                ],
                "dbe:bloodGroup": {
                    "@id": "dbe:ONegative"
                },
                "dbe:supplyStatus": {
                    "@id": "dbe:SupplyNeeded"
                },
                "variableMeasured": "Blood supply of group 0-",
                "observationAbout": {
                    "@id": "https://example.org/centres/123"
                },
                "observationDate": "2026-11-05",
                "value": 25,
                "unitCode": "P1",
                "minValue": 0,
                "maxValue": 100
            }
        ]
    }
}