One my acquaintance studying Turkish language at university.
And she wanna know when we use certain genitive relationship and when indefinite genitive relationship(I don´t know the real terms,I´m sorry...)
I don´t know how to explain her.
1)Mustafa´nın mağazası 
2)Hukuk fakültesi
My opinion is that when we wanna say something that belongs to some human being that when use certain genitive relationship,and when we wanna connect two things that we use indefinite genitive relationship?
Am I close? 

http://www.turkishclass.com/forumTitle_55032

Look at my posts in the topic.

Thank you.

I hope it helped.

Well,she didn´t respond to my message yet,we´ll see.
I alrealdy understood this,but whatever thank´s.