Memstate models are strongly typed object graphs

memstate-graph-example.cs

//user defined model with collections of user defined entities
class MyGraph {
    Dictionary<Guid,Customer> Customers;
    Dictionary<Guid,Order> Orders;
    Dictionary<Guid,Product> Products;
}

class Order {
   Customer Customer;
   List<OrderLine> Lines;
}

class OrderLine {
   Product Product;
   Quantity Quantity;
}

//Customers who purchased an Echo
var customerNames = graph.Orders.Values
  .Where(order => order.Lines.Any(line => line.Product.Name == "Echo"))
  .Select(order => order.Customer.CompanyName)
  .Distinct();