Details on REST API for _configureInSystem

Summary:

I have a system configuration which has been designed to handle multiple models under same path which is being provisioned by Client using data tables.

In order to create REST Integrations for the products I have see that in most cases the target model path is depicted as below: "targetModelPath": "_root$%#%$prodFamily:prodLine:prodModel%$#$%16%$#$%0".

In most cases $#$%16%$#$%0 is always $#$%0%$#$%0. Wanted to understand what does the number(16 or 0) in the string signify and How to map it for each new model.