WRAPPER MAINTENANCE

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WRAPPER MAINTENANCE

• ??p??µat??? ???as?a
• ?a???aµp?? ??t. ?s???a?????
• ??ad?µa??? ?t??2005-2006

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?????S ?????S??S?S

• ?? e??a? wrapper,p?? pa???eta?, ???sµ?? wrapper
  maintenance p??ß??µat??.
• S??t?µ? pa???s?as? ???sµ???? e??as??? se wrapper
  verification ?a? se wrapper reinduction.
• ?a???s?as? t?? e??as?a? µa? ?d?a , ap?te??sµata.
• S?µpe??sµata-µe????t??? e??as?a.

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?? 80 t?? ?st?se??d?? pe??????? ded?µ??a ta
?p??a p???????ta? ap? µ?a ??.
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T? e??a? ? web wrapper?

• Web wrapper e??a? ??a p????aµµa t? ?p??? µe ß?s?
  ??a s????? ?a????? e???e? a?t?µata p????f???a ap?
  ?st?se??de? ?a? t?? ap????e?e? se µ?a d?µ?µ???
  µ??f?.
• To s????? t?? ?a????? ßas??eta? st?? ?a??????t?ta
  p?? ?p???e? st?? pa???s?as? t?? p????f???a? st??
  ???st? (layout).

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Data Integration wrappers
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???p?? pa?a????? wrappers

• 1?? t??p??
• ?????aµµa se ??p??a ???ssa.
• ?s?µf???.
• 2?? t??p??
• Wrapper Induction System
• ??s?d??S????? ?st?se??d?? µe
• pa?ade??µata ep???µ?t?? p????f???a?.
• ???d?? wrapper

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Wrapper Maintenance

• ?? ?st?se??de? a??et? s???? a??????? layout,
  a??µa ?a? pe??e??µe??.
• ?? s????? t?? ?a????? e?a????? t?? wrapper pa?e?
  ?a e???e? t?? ep???µ?t? p????f???a.
• Wrapper Maintenance
• Wrapper verification Wrapper reinduction

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?????S ?????S??S?S

• ?? e??a? wrapper,p?? pa???eta?, ???sµ?? wrapper
  maintenance p??ß??µat??.
• S??t?µ? pa???s?as? ???sµ???? e??as??? se wrapper
  verification ?a? se wrapper reinduction.
• ?a???s?as? t?? e??as?a? µa? ?d?a , ap?te??sµata.
• S?µpe??sµata-µe????t??? e??as?a.

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STRAWMAN
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RAPTURE

• ???t? content based µ???d?? Kushmerick
• ?????t?ta HTML ?a?a?t???? ?.? p?? a??????e? t??
  ?a?????? ?ata??µ?

• G?a t?? testing se??de? ?p??????e? µe ß?s? t??
  e?t?µ?t??e? µ1,s1 t?? p??a??t?te? ??a ???e
  ?????sµa ta e?a??µe?a ded?µ??a a?? attribute ?a
  pa?????? t?? t?µ?? t???.
• Testing probability µe ß?s? µ2,s2
• S?????s? testing probability µe threshold

• ?p? t?? verified p????f???a ?p??????e? t??
  e?t?µ?t??e? µ1,s1 ?a??? ?a? t?? p??a??t?te? ta
  e?a??µe?a ded?µ??a ??a t? ???e attribute ?a
  pa?????? t?? t?µ?? t???.
• Verified probability ?a? ?p?????sµ?? µ2,s2

• ???a ?????sµata ?????t?ta ??aµµ?t??, p????t?ta
  ??f???, p????t?ta ?a?a?t???? st????,p?????
  tokens,µ???? tokens.

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Wrapper Verification (Lerman,Minton,Knoblock)

• ?e?t??s? RAPTURE a??????µ??.
• DATAPROG a??????µ?? e??es?? patterns p????f???a?.
• Stat?st???? ??e???? Pearson.
• G?a ???e ????? pattern p??s??te? ??a? ??? t??
  µ??f??
• Ntuples training attribute, ntuples
  testing attribute, rituples p?? a????????? t?
  pattern pi

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WRAPPER REINDUCTION(Raposo, Pan, Viña, Álvarez )

• ?p????e?s? ap?te?esµ?t?? queries ?at? t? d????e?a
  t?? ????? ?e?t?????a? t?? wrapper se ??.
• ??e??es? pa?ade??µ?t?? st?? a??a?µ??e?
  ?st?se??de?.
• ???f?d?t?s? WI s?st?µat?? µe a??a?µ??e?
  ?st?se??de? ?a? pa?ade??µata.

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?????S ?????S??S?S

• ?? e??a? wrapper,p?? pa???eta?, ???sµ?? wrapper
  maintenance p??ß??µat??.
• S??t?µ? pa???s?as? ???sµ???? e??as??? se wrapper
  verification ?a? se wrapper reinduction.
• ?a???s?as? t?? e??as?a? µa? ?d?a , ap?te??sµata.
• S?µpe??sµata-µe????t??? e??as?a.

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G?at? d????e ?µfas? st? wrapper verification?

• ??a ?a?? reinduction s?st?µa ????? ??a ?a??
  verification s?st?µa de? ap?d?de? ?a??.
• ? a????? ??a a?t?µat?p???s? t?? verification
  µ????? e??a? µe?a??te?? ap? t?? reinduction ????
  t?? ?pa???? WI systems.

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ARMAGEDDON

• ?????????S???? VERIFICATION module
• Content based s?st?µa.
• S???et?? a??????µ??e?µeta??e?eta? ?s?
  pe??ss?te?? t? d?µ? t?? e?a??µe??? p????f???a?.
• ????st?.
• ???? ?a?? ap?d?s? st? verification task.
• ?????????S???? REINDUCTION module
• ?p?? ?d?a
• ?a?? ap?d?s? se se??de? µe stat??? pe??e??µe??.
• ?????t??? e??a?e?? ??a t?? ???st?.

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Verification System

• ??s?d?? Training attribute , Testing Attribute.
• ?????st? ?t? ? p????f???a t?? testing attribute
  e??a? ? s?st? .
• ??a ?d?a s?µas??????a µe t?? training
  attribute
• ??a pa??µ??a d?µ? ?a? pa??µ??a patterns !!!

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St?d?a Verification a??????µ??
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?atas?e?? ??a??sµ?t?? ?etap????f???a?
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?a??de??µa d?a??sµat??

• ??s?d??
• 12 Aiginitoy Street
• 11 Antifylou Street
• 42 Hrwwn Polytexneiou
• Street
• 25 Laodikeias Street
• 53 Papagou Avenue

• ?????sµa
• ltaddress,5,1,
• INTEGER
• CAPITALIZED
• CAPITALIZED,5,
• 0.101, 0.111,
• 0.707,0,5.6875,3.2gt

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????s? Patterns

• ?atas?e?? ?e?a???a? token types.
• ?e?t???? a?a??t?? p?? ap???µe? se ???e token t?
  p?? s???e???µ??? t?p? p?? µp??e? ?a ??ße?.

CS123 ALPHANUM 12
INTEGER 12.3 DECIMAL DATABASE
ALLUPPERCASE course ALLLOWERCASE !
PUNCT Alice CAPITALIZED TheBook
ALPHABETIC
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????s? Patterns

• ???sd????sµ?? µ????? starting patterns µe ß?s? t?
  µ?s? p????? ?e?t???? µ???d?? a?? e???af?.
• Null Hypothesis Testing.
• ?e?t???? ???a?? ?e???µa.
• ?-test

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??? ?e?t????e?? (1)

• T?s? 1 ? t?p?? CAPITALIZED de? e??a? stat?st???
  s?µa?t???? (null hypothesis).
• ?? ap????f?e? ? µ?de???? ?p??es?

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??? ?e?t????e?? (2)

• T?s? 2 ? t?p?? ?LPHANUMERIC de? e??a? stat?st???
  s?µa?t???? µet? t? t?p? CAPITALIZED(null
  hypothesis).
• ?? ap????f?e? ? µ?de???? ?p??es?

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??? ?e?t????e?? (3)

• ?a???eta? ??a PATTERN tree.
• ß????f(µ?s? p????? tokens/e???af?).
• ???s??s? t?? d??d??? d??e? ta starting patterns!

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??e???? Pearson (goodness of fit method)

• Training (ver) ?a? testing (test) d?a??sµata
  µetap????f???a?.
• ??e???? ?µ???t?ta? d?a??sµ?t??.
• G?a digDen(x1),..,averNumOfTokensPerLine(x6)

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S?st?µa p?????

• ?? qlt? ?p?? ??2(freedomDegrees-1,0.05) t?te t?
  s?st?µa e?s???eta? se ??a s?st?µa p?????.
• ????? ??at? q a????eta? ????? ?a a??????ta?
  a?t?st???a ?? ßa?µ?? e?e??e??a?.
• S???et? s?st?µa
• ?d?a s?µas??????a ? pa??µ??a patterns

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?as???? ?????e? t?? s?st?µat?? p????? (1)

• ?µ?de? s?s?et???µe??? token types.
• ?µ?da1,ALPHANUM,
• ?µ?da2ALPHABETIC,ALLUPPERCASE,ALLLOWERCASE
  ,CAPITALIZED,
• ?µ?da3INTEGER,DECIMAL,
• S?s?et???µe?a patterns.
• ?? ?p???e? 1-1 a?t?st????a µeta?? t?? token types
  se t??????st?? ??a p????? ??se??, t? ?p??? e??a?
  s????t?s? t?? p???p????t?ta? t?? p?????? tokens
  t?? µ????te??? pattern.
• S?s?et???µe?a s????a patterns P1p11,..,p1m,P2
  p21,..,p2n.
• ?? ???e pattern p1i e??a? s?s?et???µe?? µe ??p???
  p2j ?a? a?t?st??f??.

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?as???? ?????e? t?? s?st?µat?? p????? (2)

• ?????? e???af?? st? training attribute p?? µa?
  ep?t??p??? ?a ????µe a???µ??? pep????s? ?t?
  ????µe de? ta pe??ss?te?a ap? ta patterns ?at?
  t?? e?pa?de?s?.
• ??????s? pe??pt?se?? ??a t? s??s? t?? s??????
  patterns Pver Ptest.

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?as???? ?????e? t?? s?st?µat?? p????? (3)

• ???e? pa??µet??? p?? ?aµß????ta? ?p???? e??a?
• ???????t?te? Pver Ptest Pcommon
• ??s?st? e???af?? t?? Ptest p?? ?a??pt??ta? ap? ta
  ????? patterns.

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Reinduction System

• ???sa?µ?sµ??? st?? ???p???s? t?? STALKER p??
  d?a??taµe (single ?a? ??? multi slot extractor).
• Brute force a??????µ?? a?a??t?s?? pa?ade??µ?t??
  ????? p????f???a? st?? a??a?µ??e? ?st?se??de?.
• ???d?? annotation files st? format p?? ???e? ?
  STALKER.

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??de??µe?a ?e?t?????a? verification s?st?µat??

• a ?? s?st?µa s?µpe?a??e? ?t? ? wrapper
  ?e?t????e? s?st?
• b St?? p?a?µat???t?ta ? wrapper ?e?t????e?
  s?st?
• 4 e?de??µe?a ?e?t?????a t?? s?st?µat??

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?et????? a???????s?? Verification s?st?µat??

• acaccuracy(TPTN)/(TPFPFNTN)
• upunchanged precision TP/(TPFP)
• cpchanged precision TN/(TNFN)
• urunchanged recall TP/(TPFN)
• crchanged recall TN/(TNFP)
• Fchanged(2crcp)/(crcp)
• Funchanged(2urup)/(urup)

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RAPTURE DATASET

• 16 query-able web sites
• ??de??t??? a?af????µe
• www.altavista.com,
• www.uk.lycos.de,
• www.thriveonline.com ,
• www.news.com,
• www.usnews.com
• ?p? ???e site ???aµe e?a????
• p????f???a? ap? 1 ??? ?a? 8 attributes.

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• WEB SITE ep?ped?
• ac100,up100, cp100,ur100, cr100,
• Fchanged100
• Funchanged100

• ATTRIBUTE ep?ped?
• ac99.37,up100 cp96.55,ur99.23, cr100,
• Fchanged99.82
• Funchanged99.61

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????????s? wrapper reinduction s?st?µat??
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?a?at???s?

• To reinduction s?st?µa µp??e? ?a ???s?µ?p????e?
  ??a ?a d?e??????e? t? ???st? ?a pa???e? ??a?
  s?st? wrapper p??? e????a

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?????S ?????S??S?S

• ?? e??a? wrapper,p?? pa???eta?, ???sµ?? wrapper
  maintenance p??ß??µat??.
• S??t?µ? pa???s?as? ???sµ???? e??as??? se wrapper
  verification ?a? se wrapper reinduction.
• ?a???s?as? t?? e??as?a? µa? ?d?a , ap?te??sµata.
• S?µpe??sµata-µe????t??? e??as?a.

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S?µpe??sµata

• ???pt??? e???st??,content based s?st?µat?? ??a
  wrapper verification.
• ?e? ßas??eta? ?a????? se HTML p????t?te? ?p?? ta
  p??????µe?a
• ?µfas? st? s?µas??????a.
• ?a?at??????e ?t? ? ?d?a ?t? ta p?s?st? t??
  e???af?? p?? a????????? ??p??? ????? pattern ?a
  e??a? ?d?a st? verified st? training attribute!

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?e????t??? e??as?a

• ?fa?µ??? t?? µe??d?? se ???a p??ß??µata.
• ??te?? pe???µata ??a a???????s? wrapper
  verification s?st?µat??.
• ???pt??? s???et?te??? reinduction s?st?µat??.