The Toolkit has 2 added methods to simplify life within HUSACCT
development. The first (walkTree) walks a tree with a given number of
types, IE: walkTree(parentNode, TYPE, NAMESPACEPART, BLOCK). This
returns the descendant from parentNode with parent BLOCK, with parent
NAMESPACEPART, with parent TYPE, with parent parentNode.

Second method (hasChild) is pretty self-explainatory.