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Providing resilient XPaths for external adaptation engines Session 3: Adaptation, June 14 3pm Northrop Frye Hall

Technology
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Providing Resilient Xpaths for External Adaptation Engines Iñaki Paz LKS, S. Coop. ONEKIN Research Group – UPV/EHU Donostia - San Sebastián, Spain June 14th, 2010
Index ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Introduction
Adaptation aware Web Applications Architecture: Server Browser Depending on user profile and context, the Web Application reacts executing adaptation rules providing personalized contents. RULES “kind of” CONFIGURE ADAPTATION HTTP URL + Params Content Adaptation Rules Rules address what is adapted and how, based on user profile and context
Adaptation Aware Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Adaptation as an Application Layer ,[object Object],[object Object],[object Object],Architecture: Application Layer Browser Adapted Content HTTP / HTML? Content Protocol Adaptation Layer ,[object Object],[object Object],[object Object],Adaptation Rules
External Adaptation Architecture: Application Layer Browser HTTP / HTML Content (HTML Pages) Adaptation Layer Adapted Communication Protocol Adapted Content Content (HTML Pages) HTTP / HTML? ,[object Object],[object Object],[object Object],[object Object]
External Adaptation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Application Layer Content (HTML Pages) Adaptation Layer
Index ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],XPath to Select Contents
External Adaptation XPATH is a language to select nodes in XML Documents XPATH is based on the TREE Structure of Documents /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/tr[4]
Web App Pages Change!!! /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[4] /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[6] If the page changes, wanted element may not be correctly selected
Web App Pages Change!!! /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[4] /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[6] If the page changes, wanted element may not be correctly selected OUR OBJECTIVE IS TO OBTAIN CHANGE RESILIENT XPATH EXPRESSIONS
Web App Pages Change!!! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],/html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[4] /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[6] //table[@cellpadding=‘2’]/tr[count(*)=1]
Web App Pages are different!!! ,[object Object],[object Object],[object Object]
Index ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Web Pages get changed!!!!
Variability in Space ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
XPath Induction /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[3] /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[6] Each STEP in an absolute XPATH selects one and only one ELEMENT
Induction: Differences on Paths ,[object Object],/a[n]/b[m]/ c[o] /a[n]/b[m]/ c[p] ---------------------- /a[n]/b[m]/ c[conds] Position /a[n]/b/c[m] /a[n]/d/c[m] ------------------ /a[n]/ *[conds] /c[m] /a[n]/b[m]/c[o] /a[n]/d/b[m]/c[o] ----------------------- /a[n] //b[conds] /c[o] Node (e.g. div vs. span) Depth
[object Object],Induction: Differences on Paths /a[n]/b[m]/c[o] /a[n]/d[m]/c[p] ------------------ /a[n] /*[conds]/c[conds] Position & node combination ,[object Object],/html/body[1]/table[2]/tr[1]/…/ table[3] / tr[7] /html/body[1]/table[2]/tr[1]/…/ table[2] / tr[10] ------------------ /html/body[1]/table[2]/tr[1]/ … / table[@width='100%'][@border='0'] [@cellpadding='2'][@cellspacing='0'][tr] / tr[count(*)=1][count(td)=1]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Induction Algorithm html/body[1]/table[2]/tr[1]/ … /table[@width='100%'][@border='0'] [@cellpadding='2'][@cellspacing='0'][tr]/tr[count(*)=1][count(td)=1]
[object Object],[object Object],[object Object],[object Object],[object Object],Web Pages Evolve in time!!!
[object Object],[object Object],[object Object],[object Object],Web Pages Evolve in time!!!
[object Object],[object Object],[object Object],[object Object],[object Object],Web Pages Evolve in time!!!
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Simulated Annealing
[object Object],[object Object],[object Object],Simulated Annealing
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Simulated Annealing
[object Object],[object Object],Simulated Annealing
[object Object],[object Object],Simulated Annealing Note that optimized Xpaths somehow determine WHAT characterizes the selection on the document
Index ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Evaluation
Evaluation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Evaluation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Index ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Conclusions
Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object]
Contact Iñaki Paz [email_address] http://www.lks.es http://www.onekin.org

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HT2010 Paper Presentation

  • 1. Providing Resilient Xpaths for External Adaptation Engines Iñaki Paz LKS, S. Coop. ONEKIN Research Group – UPV/EHU Donostia - San Sebastián, Spain June 14th, 2010
  • 2.
  • 3. Adaptation aware Web Applications Architecture: Server Browser Depending on user profile and context, the Web Application reacts executing adaptation rules providing personalized contents. RULES “kind of” CONFIGURE ADAPTATION HTTP URL + Params Content Adaptation Rules Rules address what is adapted and how, based on user profile and context
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9. External Adaptation XPATH is a language to select nodes in XML Documents XPATH is based on the TREE Structure of Documents /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/tr[4]
  • 10. Web App Pages Change!!! /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[4] /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[6] If the page changes, wanted element may not be correctly selected
  • 11. Web App Pages Change!!! /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[4] /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[6] If the page changes, wanted element may not be correctly selected OUR OBJECTIVE IS TO OBTAIN CHANGE RESILIENT XPATH EXPRESSIONS
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  • 16. XPath Induction /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[3] /html/body[1]/table[2]/tr[1]/td[3]/table[1]/tr[1]/td[2]/table[3]/ tr[6] Each STEP in an absolute XPATH selects one and only one ELEMENT
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  • 33. Contact Iñaki Paz [email_address] http://www.lks.es http://www.onekin.org