The Attribution Library is where the simulation specific attribution is stored. It can be reused between databases and is typically a subset of all the different types of data in the database. When you create a simulation attribute, you assign a small piece of programming that is used to populate the database. This allows you to quickly create a new attribute and  populate the entire database in only a couple of minutes.

Since the search is programmatic, you can search for features with any attribution or geometry representation. For example when you can create a simulation attribute that will be only assigned to short roads, you can create the small section of programming which uses the length of the roads as well as any other attributes. Another example would be identifying all the building features whose first edge points towards North. This is very configurable and allows you to add diversity to your database very easily and very fast.