[Kantara - Community] Attributes from multiple APs

Hello everyone, I am starting a thesis work on attributes management and aggregation in a federated identity environment and I am trying to figure out how to address attributes resolution in a scenario where there are multiple Attribute Providers. The main issue is: how does a relying party know which AP is responsible for a given attribute? As I am doing a research, I would like to know if in Kantara this problem has been faced and, if so, how you have solved it. Thank you for your time and consideration. Best Regards, Mauro -- Mauro L Polytechnic University of Turin