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Path information based extensible markup language (XML) ancestor-descendant indexing method

A technology of extended markup language and path information, which is applied in the field of computer databases and can solve problems such as low efficiency

Inactive Publication Date: 2011-05-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, for more complex queries such as A 1 / / A 2 / / A 3 ...An and the like, the structural connection algorithm usually divides them into ancestor-descendant pairs such as A1 / / A2 and A2 / / A3, and then further connects these operation results, which is relatively inefficient

Method used

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  • Path information based extensible markup language (XML) ancestor-descendant indexing method
  • Path information based extensible markup language (XML) ancestor-descendant indexing method
  • Path information based extensible markup language (XML) ancestor-descendant indexing method

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[0039] The present invention is further described in conjunction with accompanying drawing:

[0040] An example XML document is given below from http: / / www.w3.org / TR / xquery-use-cases / , the

[0041] The website is the official website of World Wide Web Consortium (W3C), and the XML standard is formulated by W3C.

[0042] 1

[0043] 2

[0044] 3 TCP / IP Illustrated

[0045] 4 Stevens W.

[0046] 5 Addison-Wesley

[0047] 6 65.95

[0048] 7

[0049] 8

[0050] 9 Advanced Programming in the Unix environment

[0051] 10 Stevens W.

[0052] 11 Addison-Wesley

[0053] 12 65.95

[0054] 13

[0055] 14

[0056] 15 Data on the Web

[0057] 16 Abiteboul Serge

[0058] 17 Buneman Peter

[0059] 18 Morgan Kaufmann Pub...

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Abstract

The invention relates to a path information based extensible markup language (XML) ancestor-descendant indexing method. The method comprises the following steps of: (1) analyzing an XML file; (2) establishing a B+tree index; and (3) inquiring an ancestor-descendant relation by using the B+tree index. A practical index exists in the invention, and on the basis of the B+tree structure in the field of computer databases, the structure guarantees that the efficiency can be greatly improved by adopting the index compared with that without adopting the index under most of conditions, and the index is easy to realize for an XML database management system based on a relation database or an XML database management system based on Native storage; the structure is easy to realize, only once node scanning is needed, and the structure has good performance regardless of skew conditions of the data of a file; and the structure can be also used for processing complicated path queries from A1 / / A2 / / ...... / / to An, thereby avoiding dividing a long path into a plurality of ancestor-descendant pairs and effectively achieving the purpose of obtaining a query result by scanning an index node once.

Description

technical field [0001] The invention belongs to the technical field of computer databases, in particular to an XML (Extensible Markup Language, Extensible Markup Language) data indexing method, in particular to a data indexing method for realizing XML ancestor-descendant structural relationship based on path information. Background technique [0002] With the massive growth of network data, the format of network data is more and more diverse. Because XML has good scalability and self-description, XML has become the de facto data representation and data exchange standard on the current Internet. In specific applications, more and more application systems use XML standard format to publish and exchange data. For XML query, there are now standard XML query languages ​​XPath and XQuery. In order to speed up XPath and XQuery query, XML data needs to be indexed. [0003] An XML document is a tree-structured document. In XPath and XQuery queries, a difficult problem is to solve th...

Claims

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Application Information

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IPC IPC(8): G06F17/30
Inventor 张恩德赵相国刘辉林孙永佼
Owner NORTHEASTERN UNIV
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