information extractors

Hassan A. Sleiman

Information Extractors

RoadMap• Introduction• Comparison• IE Framework• Conclusions

We are talking about IEs

WrapperForm FillerNavigator

Information ExtractorOntologiser

Verifier

IE in action

¨ Input:¨ Web pages¨ Rules/patterns

¨ Output:¨ Extracted data

Extraction rules

Information extractor

Document

DataThe Da Vinci Code

Dan Brown

15.95 €

2006

Robert Langdon…

Doubleday

Comparison

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Framework

¨ IE framework.¨ Reusable.¨ Comparable results.

• Introduction• Our work:

• Survey • Framework

• Conclusions

RoadMap

Survey

¨ 62 Information Extractors identified.¨ 43 IEs are studied.

• Introduction• Our work:

• Survey • Framework

• Conclusions

RoadMap

Components

DataSet

Resultset

RuleSet

Learner

InfoExtractor

PreprocessorUtilities

<a href=“http://example.com”> the _<span> Times </span></a>

<a href=“http://example.com”> the _<span> Times </span></a>

<a “href=http://example.com”> the _<span> Times </span></a>

Tokenisation

<a “href=http://example.com”> the <span> Times </span></a>

• Tag & Text

• Word & No-Word

• Chars

Example:

DataSet 1/2

DataSet 2/2

RuleSet

Keep in mind!

Dataset

• Introduction• Our work:

• Survey • Framework

• Conclusions

RoadMap

Conclusions

¨ Goals for 2010:¨ IE Framework.¨ Survey.¨ Comparable IE implementations.¨ Marking tool.¨ Tokeniser.

¨ Achievements 2009:¨ Studying 43 IEs.¨ Framework Modules definition.

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