Great–now that we've seen how the types of participants, assets, transactions, and events are defined in the business network, let's see how instances of these types are created. The Playground tool has another feature that is very nice–it allows us to look inside the business network, while it's running, to see instances of these types, and select the Test tab at the top of the Playground page:

You'll see that the view has changed a little. On the left-hand side, we can see the participants, assets, and transactions that have been defined for this business network: Bank, BankEmployee, Customer, and LetterOfCredit, as well as transactions. You can select these, and as you do, you'll see that the right-hand pane changes. Try it!

Select the LetterOfCredit asset, and on the right-hand pane, you'll see the following (expand the view with Show All):

Wow–this is interesting! This is an actual letter of credit from our application. Let's have a look at the letter in detail, and how it maps to the type structure we examined earlier.