The following functions and classes perform operations on reference hierarchies. A reference hierarchy is a graph rooted at a particular reference maker.

• CloneRefHierarchy() - encapsulates the code necessary to clone a ReferenceTarget and the reference hierarchy emanating from it. It handles multiple instances correctly, using a RemapDir. It returns a duplicate of the entire reference hierarchy of the item passed.
• DependsOn() - Returns TRUE if there is a path of references from the mkr argument to the targ; otherwise FALSE. Note that this returns TRUE if mkr == targ.
• ClearAFlagInHierarchy() - This function clears the specified Animatable flag(s) from each item in the reference hierarchy starting at the reference maker.
• ReferenceMaker::EnumRefHierarchy() - This method walks down the reference hierarchy, recursively calling RefEnumProc::proc() on the references held by a reference, assuring each reference is called only once. T
• ReferenceTarget::DoEnumDependents() - This is used to enumerate up the reference hierarchy.
• DependentIterator - This class is useful for iterating over the direct dependents of a reference target.