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Structured Document Search and Retrieval

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Overview of structured search technology. Using the structure of a document to create better search results for document search and retrieval. How both search precision and recall is improved when the structure of a document is used. How a keyword match in a title of a document can be used to boost the search score. Case studies with the eXist native XML database. Steps to set up a pilot project.

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Structured Search Dan McCreary President Dan McCreary & Associates [email_address] (952) 931-9198 Version 4
Presentation Description ,[object Object],[object Object],[object Object]
After This Presentation Users Will Be Able To: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Background for Dan McCreary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
How Many People… ,[object Object],[object Object],[object Object],[object Object],[object Object]
Structured Search ,[object Object],[object Object],But first a story……
Information Retrieval Textbook ,[object Object],[object Object],[object Object],http://nlp.stanford.edu/IR-book/information-retrieval-book.html
117 Citations in Computer Science With 117 citations, the "Intro to IR" book is the second most cited Computer Science reference published in 2008.
Table 10.1 XML - Table 10.1 and structured information retrieval. SQLRDB (relational database) search, unstructured information retrieval   RDB search unstructured retrieval structured retrieval objects records unstructured documents trees with text at leaves model relational model vector space & others ? main data structure table inverted index ? queries SQL free text queries ?
Excerpt from IR Book… ,[object Object],[object Object],[object Object]
eXist Native XML Developers eXist Meeting Prague March 12 th , 2010
Presentation Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Table 10.1 - Revised XML - Table 10.1 and structured information retrieval. SQLRDB (relational database) search, unstructured information retrieval   RDB search unstructured retrieval structured retrieval objects records unstructured documents trees with text at leaves model relational model vector space & others XML hierarchy main data structure table inverted index trees with node-ids for document ids queries SQL free text queries XQuery fulltext
Relational DB Boolean Search ,[object Object],[object Object],[object Object],SELECT * FROM PERSON WHERE TITLE = 'manager' ORDER BY SALARY Note that the "order" is not the quality of a mach but another column in a table
Vector Model ,[object Object],[object Object],Your search keyword (green) Other documents (blue) Search score is distance measurement (red) Keyword 1 Keyword 2
Reverse Index For each word, a reverse index tells you what documents contain that word. Word Document IDs hate 12344, 34235, 43513, love 12344, 34235, 43513, 22345, 12313, 42345, 12313, 13124
Reverse Index in eXist 1.5 Terms that start with "love"
Sample Keyword Search ,[object Object],[object Object],Keyword Search: Resulting Hits: Code (XQuery):
Calculating Score ,[object Object],[object Object],[object Object],[object Object],[object Object]
How is "Structured Search" Different? ,[object Object],[object Object],[object Object]
Two Models ,[object Object],[object Object],[object Object],[object Object],[object Object],'love' 'hate' 'new' 'fear' keywords keywords keywords keywords keywords keywords doc-id
Keywords and Node IDs ,[object Object],Node-id Node-id Node-id Node-id Node-id Node-id keywords keywords keywords keywords keywords keywords document-id
Subdocuments ,[object Object],[object Object],[object Object],[object Object]
Books Have Structure Book Title Book Metadata
Presentations Have Structure Find all slides with the word "XML" in their title ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
E-mail has structure ,[object Object],[object Object],[object Object],[object Object]
Sample of XML ,[object Object]
Many Objects Have Structure Spreadsheets Find all forms with a label of "Zipcode" Find all spreadsheets with a first row cell that contains the word "SSN"
But What About Microsoft Office? ,[object Object],Office Open XML (also informally known as OOXML or OpenXML) is a zipped, XML-based file format developed by Microsoft for representing spreadsheets, charts, presentations and word processing documents. File extensions: .docx, .xlsx, .pptx are zipped folders that contain XML files ECMA-376
Open Document XML Formats ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Benefits ,[object Object],[object Object],[object Object],Target documents Other documents Actual Search Results Missed Document
Results from Studies ,[object Object],[object Object],[object Object],[object Object],Source: INEX 2003/2004 "Bag-of-words" vs. "full structure"
Tibetan Buddhist Resource Center (TBRC) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1 (low) 5 (high)
Woodruff Library, Emory University ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1 (low) 5 (high)
Challenges ,[object Object],[object Object],[object Object],[object Object]
Getting Data into XML ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What to Return in a Hit ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Allow searchers to specify level with search options ,[object Object],[object Object],[object Object],[object Object],[object Object]
Steps in Testing Structured Search ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Steps in Structured Search Project ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sample Queries ,[object Object],Find all "SPEECH" elements that contains the keyword 'love' (predicate or "WHERE" clause)
Near Operator ,[object Object],[object Object]
Skillsets Needed for Pilot Project ,[object Object],[object Object],[object Object],[object Object]
Predictions ,[object Object],[object Object],[object Object],[object Object],[object Object]
Steps to Run Examples ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sample Configuration File ,[object Object],Example of boost on title
XQuery Fulltext
XQuery/Lucene Search Wikibook
Acknowledgements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Send e-mail to dan@danmccreary.com for extended list of "getting started" resources.
Questions? Dan McCreary President Dan McCreary & Associates [email_address] (952) 931-9198

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Structured Document Search and Retrieval

  • 1. Structured Search Dan McCreary President Dan McCreary & Associates [email_address] (952) 931-9198 Version 4
  • 2.
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  • 8. 117 Citations in Computer Science With 117 citations, the "Intro to IR" book is the second most cited Computer Science reference published in 2008.
  • 9. Table 10.1 XML - Table 10.1 and structured information retrieval. SQLRDB (relational database) search, unstructured information retrieval   RDB search unstructured retrieval structured retrieval objects records unstructured documents trees with text at leaves model relational model vector space & others ? main data structure table inverted index ? queries SQL free text queries ?
  • 10.
  • 11. eXist Native XML Developers eXist Meeting Prague March 12 th , 2010
  • 12.
  • 13. Table 10.1 - Revised XML - Table 10.1 and structured information retrieval. SQLRDB (relational database) search, unstructured information retrieval   RDB search unstructured retrieval structured retrieval objects records unstructured documents trees with text at leaves model relational model vector space & others XML hierarchy main data structure table inverted index trees with node-ids for document ids queries SQL free text queries XQuery fulltext
  • 14.
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  • 16. Reverse Index For each word, a reverse index tells you what documents contain that word. Word Document IDs hate 12344, 34235, 43513, love 12344, 34235, 43513, 22345, 12313, 42345, 12313, 13124
  • 17. Reverse Index in eXist 1.5 Terms that start with "love"
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  • 24. Books Have Structure Book Title Book Metadata
  • 25.
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  • 28. Many Objects Have Structure Spreadsheets Find all forms with a label of "Zipcode" Find all spreadsheets with a first row cell that contains the word "SSN"
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  • 51. Questions? Dan McCreary President Dan McCreary & Associates [email_address] (952) 931-9198