provenance/fixme/1 matches the site

public static Activity Purchase_With_Commission()
{
    var purchase = new Activity()
        .WithContext()
        .WithId("https://linked.art/example/provenance/fixme/1")
        .WithLabel("Purchase of Sculpture with Commission")
        .WithClassifiedAs(Aat.ProvenanceActivity);

    var buyer = new Person().WithLabel("Buyer");

    purchase.Part = [
        new Payment
        {
            PaidAmount = new MonetaryAmount
            {
                Value = 900,
                Currency = Aat.UsDollars.WithNotation("USD")
            },
            PaidFrom = [buyer],
            PaidTo = [new Person().WithLabel("Seller")]
        },
        new Payment
        {
            PaidAmount = new MonetaryAmount
            {
                Value = 100,
                Currency = Aat.UsDollars
            },
            PaidFrom = [buyer],
            PaidTo = [
                new Group()
                    .WithLabel("Auction House")
                    .WithClassifiedAs(Aat.Term("300417515", "Auction House (organization)"))
            ]
        }.WithClassifiedAs(Aat.Term("300393199", "Commission"))
    ];

    return purchase;
}

• 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/fixme/1",
    Label = "Purchase of Sculpture with Commission",
    ClassifiedAs = [Aat.ProvenanceActivity],
    Part =
    [
        new Payment
        {
            PaidAmount = new MonetaryAmount
            {
                Value = 900,
                Currency = new Currency("http://vocab.getty.edu/aat/300411994", "US Dollars")
                {
                    Notation = "USD",
                },
            },
            PaidFrom =
            [
                new Person
                {
                    Label = "Buyer",
                },
            ],
            PaidTo =
            [
                new Person
                {
                    Label = "Seller",
                },
            ],
        },
        new Payment
        {
            PaidAmount = new MonetaryAmount
            {
                Value = 100,
                Currency = Aat.UsDollars,
            },
            PaidFrom =
            [
                new Person
                {
                    Label = "Buyer",
                },
            ],
            PaidTo =
            [
                new Group
                {
                    Label = "Auction House",
                    ClassifiedAs = [Aat.Term("300417515", "Auction House (organization)")],
                },
            ],
            ClassifiedAs = [Aat.Term("300393199", "Commission")],
        },
    ],
};

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.