1 / 20

XML Evolution: Two-phase XML Processing Model Using XML Prefiltering Techniques

What can ONE instruction do? Enabling your XML applications efficiently processing GigaByte-level XML documents!!. XML Evolution: Two-phase XML Processing Model Using XML Prefiltering Techniques. VLDB 2006 September 12-15, 2006

sutton
Download Presentation

XML Evolution: Two-phase XML Processing Model Using XML Prefiltering Techniques

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. What can ONE instruction do?Enabling your XML applications efficiently processing GigaByte-level XML documents!!

  2. XML Evolution:Two-phase XML Processing ModelUsing XML Prefiltering Techniques VLDB 2006 September 12-15, 2006 Chia-Hsin Huang, Tyng-Ruey Chuang, James J. Lu, and Hahn-Ming Lee

  3. How much do you know about DOM and SAXin XML processing? They can not process Large XML documents efficiently!!

  4. DOM Processing Model XPath expression: /html/body/ul/li/text the Source: http://www.cee.hw.ac.uk/~alison/ netapp/dom/sld006.htm

  5. SAX Processing Model XPath expression: //entry[@id=“a2”] Source: http://www.informatik.hu-berlin.de/~obecker/Lehre/SS2002/XML/images/sax.t.gif

  6. Problems in Standard DOM and SAX Processing Models • Both DOM and SAX processing models waste a large amount of computational resources by processing uninteresting fragments. • They may not be able to query Large XML documents efficiently. • (Size of a DOM tree) : (Size of the XML doc.) = 5 : 1 • SAX cannot parse a document in a random access manner • No backtrack mechanisms (look forward parsing) • Lack of interactive mechanisms

  7. XML Processing Enhancements XML Applications • Unchangeable? • or a few modifications! Requirements? XML Standards • Unchangeable!?

  8. Issues in ExistingXML Processing Enhancements • Consume large amount of disk/memory space and CPU time (Cost: $) • Large-scale (Cost: $) • Integrate with relational database (Cost: $$$) • Complicated index/query algorithms (Cost: $$$$) • Intrusive (considerable modifications) (Cost: $$$$$) • Non-transparent (apps. need to be aware of the mechanics) (Cost: $$$$$)

  9. The Simplest Solution: Two-phase XML Processing Models using XML Prefiltering Techniques

  10. XML Prefiltering Technique The Solution XPath Expression (Issued by users’ apps.) Prefiltering Techniques (A tiny search engine) Candidate-setXML document XML Parsers (DOM/SAX) XML document

  11. Two-phase XML Processing Model – Enhanced DOM-based Applications

  12. Two-phase XML Processing Model – Prefiltering XPath Processor

  13. Two-phased XML Processing Model – Enhanced SAX-based Applications

  14. Two-phase XML Processing Model – Stream-based XPath Processor

  15. Characteristics of the XML Prefiltering Technique • Correct • Small-scale • Lightweight • Efficient • Transparent • Non-intrusive? • User applications or XML processors require adding Few (one or two) instructions

  16. Demonstrations http://www.iis.sinica.edu.tw/~jashing/prefiltering

  17. System Architecture

  18. Demo Items • System modules (http://www.iis.sinica.edu.tw/~jashing/prefiltering/Download.htm) • Indexer • Query Simplifier • Fast Lightweight Steps-Axes Analyzer • Fragment Gatherer • Micro XML Streaming Parser (an interactive streaming parser) • An Application (http://www.iis.sinica.edu.tw/~jashing/prefiltering/Applications.htm) • GML-based Web GIS (Chia-Hsin Huang, Tyng-Ruey Chuang, Dong-Po Deng, and Hahn-Ming Lee, "Efficient GML-native Processors for Web-based GIS: Techniques and Tools," to appear in the proc. of ACM-GIS'06)

  19. Thank you very much. Q&A

More Related