object/spring/31 site issue

public static HumanMadeObject Context_Specific_Assignment()
{
    var spring = new HumanMadeObject()
        .WithContext()
        .WithId("https://linked.art/example/object/spring/31")
        .WithLabel("Spring")
        .WithClassifiedAs(Aat.Painting, Aat.TypeOfWork);

    spring.IdentifiedBy = [new Name("Jeanne (Spring)").AsPrimaryName()];

    spring.AttributedBy = [
        new AttributeAssignment()
        {
            CarriedOutBy = [
                new Group()
                    .WithId("https://linked.art/example/group/nga")
                    .WithLabel("National Gallery of Art")
            ],
            Assigned = [
                new Identifier("2497-12")
                    .WithClassifiedAs(Aat.EntryNumbers)
            ],
            AssignedProperty = "identified_by",
            CausedBy = [
                new Activity()
                    .WithId("https://linked.art/example/event/post_impressionism")
                    .WithLabel("Post-Impressionism Exhibition")
            ]
        }
    ];

    return spring;
}

• Metatype classification The second argument classifies the first, not the object: WithClassifiedAs(Aat.Description, Aat.Statement) says this is a Description, and Description is a kind of Statement. The Plain C# form shows the nesting.
• Role shortcuts AsPrimaryName, AsAccessionNumber and AsSystemAssignedNumber each add a single classification, with the AAT terms Primary Name, Accession Number and System Number.

var humanMadeObject = new HumanMadeObject
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/object/spring/31",
    Label = "Spring",
    ClassifiedAs =
    [
        new Type("http://vocab.getty.edu/aat/300033618", "Painting")
        {
            ClassifiedAs = [Aat.TypeOfWork],
        },
    ],
    IdentifiedBy =
    [
        new Name("Jeanne (Spring)")
        {
            ClassifiedAs = [Aat.PrimaryName],
        },
    ],
    AttributedBy =
    [
        new AttributeAssignment
        {
            CarriedOutBy =
            [
                new Group
                {
                    Id = "https://linked.art/example/group/nga",
                    Label = "National Gallery of Art",
                },
            ],
            CausedBy =
            [
                new Activity
                {
                    Id = "https://linked.art/example/event/post_impressionism",
                    Label = "Post-Impressionism Exhibition",
                },
            ],
            AssignedProperty = "identified_by",
            Assigned =
            [
                new Identifier("2497-12")
                {
                    ClassifiedAs = [Aat.EntryNumbers],
                },
            ],
        },
    ],
};

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.