|The identity format for trades is just the text 'trade'. All other data is specified through properties.
|Merchant trades are the parts of a special merchant inventory that is typically viewed by right clicking
a villager entity. Any number of trades can fit in a single merchant inventory.
Trades are represented by TradeTags.
The properties that can be used to customize a merchant trade are:
uses=<number of uses>
max_uses=<maximum number of uses>
For example, the following command opens a virtual merchant inventory with two merchant trades.
The first trade offers a sponge for two emeralds, can be used up to 10 times,
and offers XP upon a successful transaction.
The second trade has zero maximum uses and displays a barrier.