Every Item in the Compound Graphic Sequence shall have a Compound Graphic Instance ID (0070,0226) with a value that is unique within this sequence.
There shall be one or more Items in the Graphic Object Sequence or Text Object Sequence that represents an alternate rendering of the Compound Object Sequence Item. As a linkage for backward compatibility these Items share the same Compound Graphic Instance ID (0070,0226).
Note: Every Compound Graphic has an equivalent rendering encoded as a set of simple graphic objects linked by the Compound Graphic Instance ID (0070,0226). Simple graphic objects are elements such as points, polylines, interpolated lines, circles and ellipses.The equivalent rendering is a set of simple graphic objects to support an SCP that only understands the simple graphical objects.