return {
    core = true,

    properties = {
        pref_rep = {
            uri = "pas:hasPreferredRepresentation",
            label = "Preferred representation",
            description = "Preferred representation. Used to generate \z
                a thumbnail (for a visual item) or sample (for non-visual \z
                materials such as audio).",
            type = "resource",
            range = {file = true},
        },
    }
}