Streaming XPath algorithm for XPath value index key generation

Details Streaming XPath algorithm for XPath value index key generation Streaming XPath algorithm for XPath value index key generation

2008-03-18

2008-03-18

Wong, Don (Department: 2163)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000, C707S793000, C715S252000, C715S252000

Reexamination Certificate

active

07346609

ABSTRACT:
A method generates hierarchical path index keys for single and multiple indexes with one scan of a document. Each data node of the document is scanned and matches to query nodes are identified. A data node matches a query node if the three conditions hold: if it is not the root step, there is a match for the query node in the previous step of the query; the data node matches the query node of the current step; and the edges of the data and query nodes match. A sub-tree of a data node can be skipped if the data node is not matched and its level is less than the fixed levels of the query. The matched data node is then placed in the match stacks corresponding to the match query nodes. The method uses transitivity properties among matching units to reduce the number of states that need to be tracked and to improve the evaluation of path expressions significantly.

REFERENCES:
patent: 2003/0120978 (2003-06-01), Fabbrizio et al.
patent: 2003/0163285 (2003-08-01), Nakamura et al.
patent: 2003/0212664 (2003-11-01), Breining et al.
patent: 2004/0010752 (2004-01-01), Chan et al.
patent: 2004/0103105 (2004-05-01), Lindblad et al.
patent: 2004/0167864 (2004-08-01), Wang et al.
patent: 2005/0055334 (2005-03-01), Krishnamurthy

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