Traversing an arbitrary C# object graph using XPath/applying XSL transforms

public class SomeType {
   public int myInt  { get; set; }
}

public class AnotherType {
   public string myString { get; set; }
   public SomeType mySomeType { get; set; }
}

public class LastType {
   public SomeType mySomeType { get; set; }
   public AnotherType myAnotherType { get; set; }
}

public class UserTypes{
    static void Main()
    {
        LastType lt = new LastType();
        SomeType st = new SomeType();
        AnotherType atype = new AnotherType();

        st.myInt = 7;
        atype.myString = "BOB";
        atype.mySomeType = st;
        lt.mySomeType = st;
        lt.myAnotherType = atype;

        string xmlOutput = YourAwesomeFunction(lt);
    }
}

<ObjectMap>
 <LastType id="0">
   <mySomeType idref="1" />
   <myAnotherType idref="2" />
 </LastType>

 <SomeType id="1">
  <myInt>7</myInt>
 </SomeType>

 <AnotherType id="2">
  <myString>BOB</myString>
  <mySomeType idref="1" />
 </AnotherType>
</ObjectMap>