return {
    core = true,

    properties = {
        date = {
            uri = "pas:date",
            label = "Date",
            description = "Date related to the artifact.",
            type = "string",
        },
        location_descr = {
            uri = "pas:locationDescription",
            label = "Location description",
            description = "Verbal description of the artifact's location.",
            type = "string",
        },
        location_url = {
            uri = "pas:locationUrl",
            label = "Geolocation URL",
            description = "Link to a map locating the artifact.",
            type = "string",
        },
    },
}