event/stowe/1 matches the site

public static Activity Stowe_Auction_1()
{
    var stowe = new Activity()
        .WithContext()
        .WithId("https://linked.art/example/event/stowe/1")
        .WithLabel("Auction of Stowe House")
        .WithClassifiedAs(Aat.AuctionEvent);

    var timespan = new LinkedArtTimeSpan().WithDaysDimension(3);
    timespan.BeginOfTheBegin = new LinkedArtDate(1848, 8, 1);
    timespan.EndOfTheBegin = new LinkedArtDate(1848, 8, 20).LastSecondOfDay();
    timespan.BeginOfTheEnd = new LinkedArtDate(1848, 9, 9);
    timespan.EndOfTheEnd = new LinkedArtDate(1848, 9, 30).LastSecondOfDay();
    timespan.IdentifiedBy = [
        new Name("40 days in August and September, 1848")
    ];

    stowe.TimeSpan = timespan;

    return stowe;
}

• Dimensions and physical description Each helper builds a Dimension with its AAT type, value and unit, or a classification with its metatype: height, width, colour, shape, page count, component count, file size, duration in days.

var activity = new Activity
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/event/stowe/1",
    Label = "Auction of Stowe House",
    ClassifiedAs = [Aat.AuctionEvent],
    TimeSpan = new LinkedArtTimeSpan
    {
        IdentifiedBy = [new Name("40 days in August and September, 1848")],
        BeginOfTheBegin = new LinkedArtDate(1848, 8, 1),
        EndOfTheBegin = new LinkedArtDate(1848, 8, 20, 23, 59, 59),
        BeginOfTheEnd = new LinkedArtDate(1848, 9, 9),
        EndOfTheEnd = new LinkedArtDate(1848, 9, 30, 23, 59, 59),
        Duration = new Dimension
        {
            Value = 3,
            Unit = Aat.Days,
        },
    },
};

Generated from the object the example builds: every property that is set, as object initialisers, with the vocabulary constants where a term is in the registry. The fluent helpers are a convenience, not a requirement; this form and the one as written produce the same JSON.