return {
    core = true,

    properties = {
        ext_id = {
            uri = "dc:identifier",
            label = "External system ID",
            type = "string",
        },
        alt_label = {
            uri = "dc:alternative",
            label = "Alternative Label",
            type = "string",
        },
        description = {
            uri = "dc:description",
            label = "Description",
            type = "string",
        },
        last_modified_by = {
            uri = "dc:contributor",
            label = "Last Updated By",
            type = "rel",
            range = {agent = true},
        },
        submitted_by = {
            uri = "dc:creator",
            label = "Submitted By",
            type = "rel",
            range = {agent = true},
        },
    },
}