provenance/5 matches the site

public static Activity Copyright_Acquisition()
{
    var activity = new Activity()
        .WithContext()
        .WithId("https://linked.art/example/provenance/5")
        .WithLabel("Copyright acquisition by PCA")
        .WithClassifiedAs(Aat.ProvenanceActivity);

    activity.Part = [
        new RightAcquisition
        {
            Establishes = [
                new Right()
                    .WithClassifiedAs(Aat.Term("300055598", "Copyright"))
                    .WithPossessedBy(new Group().WithLabel("Paintings Copyright Association"))
                    .WithAppliesTo(Painting.WithClassifiedAs(Aat.Artwork))
            ]
        }
    ];

    return activity;
}

• Terms outside the registry The vocabulary registry holds only the terms linked.art itself publishes, so a dataset's own concepts, places and people are written with Aat.Term, Tgn.Place and Ulan.Person, giving the id and the label.

var activity = new Activity
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/provenance/5",
    Label = "Copyright acquisition by PCA",
    ClassifiedAs = [Aat.ProvenanceActivity],
    Part =
    [
        new RightAcquisition
        {
            Establishes =
            [
                new Right
                {
                    ClassifiedAs = [Aat.Term("300055598", "Copyright")],
                    PossessedBy =
                    [
                        new Group
                        {
                            Label = "Paintings Copyright Association",
                        },
                    ],
                    AppliesTo =
                    [
                        new HumanMadeObject
                        {
                            Label = "Painting",
                            ClassifiedAs =
                            [
                                new Type("http://vocab.getty.edu/aat/300033618", "Painting")
                                {
                                    ClassifiedAs = [Aat.TypeOfWork],
                                },
                                Aat.Artwork,
                            ],
                        },
                    ],
                },
            ],
        },
    ],
};

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.