public static async Task Lesson(DataServiceRestClient client)
{
//A catalog must have at least one attribute.
//Attributes with entity 'Catalog' must not be of type 'CatalogAttribute'
await client.CreateAttributeDefinitions(EntityDto.Catalog, new[] { MachineName, MachineNumber, MachineVendor });
//Create the catalog
await client.CreateCatalogs(new[] { MachineCatalog });
//Add an attribute
MachineCatalog.ValidAttributes = MachineCatalog.ValidAttributes.Append(MachineVendor.Key);
await client.UpdateCatalogs(new[] { MachineCatalog });
//Add an entry
await client.CreateCatalogEntries(MachineCatalog.Uuid, new[] { EntryXenos });
//Update existing catalog entries
EntryAccura.Attributes = EntryAccura.Attributes.Append(new AttributeDto(MachineVendor.Key, "Zeiss"));
EntryContura.Attributes = EntryContura.Attributes.Append(new AttributeDto(MachineVendor.Key, "Zeiss"));
await client.UpdateCatalogs(new[] { MachineCatalog });
}