At&t Intellectual Property I, LP

SungRan Cho

Divesh Srivastava

Nick Koudas

In accordance with a method of encoding meta-data associated with tree-structured data, a first set of elements of a plurality of elements in the tree-structured is associated explicitly with explicit meta-data levels, and a second set of elements of the plurality of elements is associated by inheritance with explicit meta-data levels of closest ancestor elements of the first set of elements. The plurality of elements is packed into a plurality of leaf nodes of an index structure. The plurality of leaf nodes is merged into a plurality of non-leaf nodes until a root non-leaf node is generated. The plurality of non-leaf nodes of the index structure is associated with indicators representing ranges of the explicit meta-data levels in the packed first set of elements, such that explicit meta-data level ranges of descendant non-leaf nodes are subsets of explicit meta-data level ranges of ancestor non-leaf nodes.

Meta-data indexing for XPath location steps

Techniques are disclosed that efficiently support the querying of meta-data in XML documents. The techniques include efficiently identifying XML elements along each location step in an XPath query that satisfy range constraints on ordered meta-data. The techniques include generating an inheritance meta-data index in which actual meta-data levels are associated only with elements for which a value is explicitly specified and associating non-leaf nodes of the index structure with inherited meta-data levels and inheritance source nodes. The techniques may be used with navigation-based and join-based XPath evaluation strategies.

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Hannover, Germany

SungRan Cho