OQL Syntax, weird prefix

Hello, I am using the OQL playground and have a question. Why do I need to execute “SELECT City FROM Sales.Address” and not “SELECT City FROM Address”? What is the purpose of Sales? Also from where does this value “Sales” come from?  
1 answers

City is the Attribute, Address is the Entity and Sales is the Domain model.

You need to specify the Domain model because you can have entities with the same name across multiple domain models.