[HELP] Can't make validator accept this "thumbnailUrl" cleanly #4452
Description
The Validator give me a warning that I don't understand.
The property additionalType is not recognized by the schema (e.g. schema.org) for an object of type URL.
SoftwareSourceCode contains thumbnailUrl of type URL.
And that class contains additionalType of type Thing (all my fields wind up under the latter's image property).
Haven't figured out why I need to add @type statements for the listed classes for thumbnailUrl and additionalType either as I'm just restating what the documentation already says.
{
"@context": "https://schema.org",
"@type": "SoftwareSourceCode",
"schemaVersion": "https://schema.org/version/29.2",
"sdDatePublished": "2025-05-15",
"thumbnailUrl": {
"@type": "URL",
"additionalType": {
"@type": "Thing",
"image": {
"encodingFormat": "image/png",
"width": {
"@type": "QuantitativeValue",
"unitCode": "E37",
"value": 96
},
"height": {
"@type": "QuantitativeValue",
"unitCode": "E37",
"value": 64
},
"description": "Logo",
"url": "https://example.com/special/img/logo-96x64.png"
}
}
}
}As I still haven't gotten this going, what would be the canonical means of doing so?