c# - POCO objects to UML representation -


i want correctly represent poco classes of entity framework in uml diagram. instance, have following relationships : 

public class schoolgroup {      public int id {get;set;}      public string groupname {get;set;}      public subject groupsubject {get;set;}      public teacher groupteacher {get;set;}      public icollection<student> attendeestudents {get;set;} }

here see school group entity contains of instances of subject, teacher , collection of students.

according post difference between association, aggregation , composition :

association - have relationship object. foo uses bar.

composition - own object , responsible lifetime, when foo dies, bar.

aggregation - have object i've borrowed else. when foo dies, bar may live on.

so, how should represent schoolgroup in uml notation : composition or aggregation?


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