Classes in org.w3c.dom.traversal used by org.apache.xerces.dom
DocumentTraversal contains methods that create iterators and
tree-walkers to traverse a node and its children in document order (depth
first, pre-order traversal, which is equivalent to the order in which the
start tags occur in the text representation of the document).
Filters are objects that know how to "filter out" nodes.
Iterators are used to step through a set of nodes, e.g.
TreeWalker objects are used to navigate a document tree or
subtree using the view of the document defined by their
whatToShow flags and filter (if any).