The Content class is the interface for the Image, VolumeSystem, etc. classes. The getChildren() method of each object returns the children objects as a Content object. You can use ContentVisitor to use the visitor pattern to correctly process it.</p>

<p>In general, the type of a child is known, but there are a few cases where this is not the case. One obvious example is that the child of an Image can be either a VolumeSystem or a FileSystem. The former occurs when the image has partitions and the latter oc