A bound instance of an IPointer object allows a packager to associate
a specific XML node set in the same IMS Manifest Document that contains
it or an XML node set in a different IMS Manifest Document instance with
the parent object containing an IMS Pointer instance.
A referenced node set must be a valid child of the referencing parent element,
both as to kind and multiplicity in a referencing parent's context.
Represents a binding of the kinds of objects defined as children of ims-cp-imManifest : Manifest.[ ManifestMetadata, Organizations, Resources, Manifest, Extension ].