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Recently, the researchers have proposed a number of labeling schemes. In these labeling schemes, the approach which can extract structural information between nodes and process query efficiently is more outstanding. However, most of these labeling schemes do not well support update operations. To achieve update-friendly operations, some of the methods keep intervals between labeling numbers, but it requires whole relabeling when the intervals are used up. Several labeling schemes support dynamic XML documents, but most of these labeling schemes allow only leaf node insertions. OrdPathX supports both leaf node insertions and internal node insertions.
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