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* <h4>Get every children of a node, even if it doesn't have any registered events, as opposed to getChildren</h4>
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* @return Collection containing all the children.
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public abstract Collection<TmfStatisticsTreeNode> getAllChildren(final TmfFixedArray<String> path);
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* <h4>Get the map of existing elements of path classified by parent.</h4>
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public Map<String, Set<String>> getKeys() {