title: Adding properties to many to many relationship?
body: <p>I have been using Core Data to model my database. I have 2 entities that are in many to many relationship. Each person can have many addresses, and on each address multiple persons can live. </p>
  
  <p>Now i would like to add property to this relationship. For example one person - address will have label home, other person - address can will have label mama's place.</p>
  
  <p>I can't add this property on address entity, because same address will have different labels for different persons.</p>
  
  <p>Since relationships are modeled like <code>NSSet</code>s, I don't see a way to do what I want.</p>
  
  <p>Can this be somehow done?</p>