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. the
set of nodes in a
NodeList, the document subtree governed by
Node, the results of a query, or any other set
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).
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