2.2.5.2.1.2 <Ref> Element

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When a particular object has been already serialized by a given instance of the serializer (see the following section 2.2.5.3.3 for details of serializer lifetime), the serializer SHOULD choose to output only <Ref> element (instead of <Obj> element with full object data).

Example:

 <!-- there are 2 objects in the list - the second object is the same as the first object -->
 <Obj><LST>
   <Obj RefId="RefId-0">
     <TN RefId="RefId-0">
       <T>System.Drawing.Point</T>
       <T>System.ValueType</T>
       <T>System.Object</T>
     </TN>
     <ToString>{X=12,Y=34}</ToString>
     <Props>
       <B N="IsEmpty">false</B>
       <I32 N="X">12</I32>
       <I32 N="Y">34</I32>
     </Props>
   </Obj>
   <Ref RefId="RefId-0" />
 </LST></Obj>