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Structural index, which acts as a schema, plays an important role in query optimization over XML and semi-structured data. On the basis of the inter-relevant successive trees (IRST), we extend IRST to the XML data graph, introduce the new equivalence relation of k-l-similarity, and propose IRST (k, l)-index, an adaptive structural index that can support branching or simple path queries efficiently...
To speed up queries over XML and semi-structured data, a number of structural indexes have been proposed. The structural index is usually a labeled directed graph defined by partitioning nodes in the XML data graph into equivalence classes and storing equivalence classes as index nodes. On the basis of the Inter- Relevant Successive Trees (IRST), we propose an efficient adaptive structural index,...
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