additional fields in NHibernate many-to-many relation tables

Question

when i have a many-to.many relation with nhibernate and let nhibernate generate my db schema, it adds an aditional table that contains the primary keys of the related entiti

Answer 1

In this case, how would you build the in the mapping file for the new entity (that acts as the bridge between the two initial tables) ? In my case this link table has two foreign keys (int), one for each initial table, plus some other fields (startDate, endDate)

The thing is, in my new entity, I do not have properties for these two foreign keys. I only have one property that is of the type of the entity the foreign key is pointing to.