CSE 428 Semantic Web Topics XML

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CSE 428Semantic Web TopicsXML

• Jeff Heflin
• Lehigh University

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XML Example
lt?xml version"1.0" ?gt ltcd sernum"99999"gt
lt!-- IMHO, a truly great CD --gt  lttitlegtYankee
Hotel Foxtrotlt/titlegt   ltartistgtWilcolt/artistgt
  ltcover photo"/covers/yht.gif" /gt   lttrack
no4"gtWar on Warlt/trackgt lt/cdgt
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XML DTD

• lt!ELEMENT cd (title, artist, track, cover?)
  gtlt!ATTLIST cd         sernum CDATA REQUIREDgt
  lt!ELEMENT title   (PCDATA) gt lt!ELEMENT artist
  (PCDATA) gt lt!ELEMENT cover EMPTYgt lt!ATTLIST
  cover         photo CDATA REQUIREDgt

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XML Schema Example

• ltxsdschema xmlnsxsd"http//www.w3.org//2000/10/
  XMLSchema"gtltxsdelement name"movie"gt ltxsdcompl
  exTypegt                lt!-- b/c it has children
  --gt ltxsdsequencegt ltxsdelement name"title"
  type"xsdstring" /gt ltxsdelement
  name"directorgt ltxsdcomplexTypegt       ltx
  sdsequencegt ltxsdelement name"title"
  type"xsdstring" minOccurs"0"
  /gt       ltxsdelement name"fname"
  type"xsdstring" /gt ltxsdelement
  name"lname" type"xsdstring" /gt lt/xsdsequ
  encegt lt/xsdcomplexTypegt   
  lt/xsdelementgt       ltxsdelement name"actor"
  minOccurs"0" maxOcurs"unbounded"
  gt        ...       lt/xsdelementgt lt/xsdsequen
  cegt    ltxsdattribute name"gross"
  type"xsddecimal" /gt lt/xsdcomplexTypegtlt/xsdel
  ementgt
• lt/xsdschemagt

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Name Conflicts?

• Elements about people title, fname, lname
• Elements about movies title, director, actor
• ltmoviegt lttitlegtStar Warslt/titlegt
  ltdirectorgt ltfnamegtGeorgelt/fnamegt ltlnamegtLuca
  slt/lnamegt lt/directorgt ltactorgt lttitlegtSirlt/tit
  legt ltfnamegtAleclt/fnamegt ltlnamegtGuinesslt/lname
  gt lt/actorgt lt/moviegt

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XML Namespaces

• ltmmovie xmlnsm"http//www.hollywood.org/movies"
  xmlnsp"http//www.standards.org/people"gt
  ltmtitlegtStar Warslt/mtitlegt ltmdirectorgt ltp
  fnamegtGeorgelt/pfnamegt ltplnamegtLucaslt/plnamegt
  lt/mdirectorgt ltmactorgt ltptitlegtSirlt/ptitlegt
  ltpfnamegtAleclt/pfnamegt ltplnamegtGuinesslt/pl
  namegt lt/mactorgt lt/mmoviegt

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XSLT Example
An XSLT Stylesheet
Original Document

• ltbookgt     lttitlegtThe Fellowship of the
  Ringlt/titlegt     ltauthorgtJ.R.R. Tolkienlt/authorgt
      ltpublishedgt1963lt/publishedgt lt/bookgt

• ltxslstylesheet version1.0 xmlnsxslhttp//w
  ww.w3.org/1999/gt
• ltxsltemplate match"/"gt lthtmlgt ltbodygt ltxslapp
  ly-templates select"book /gt lt/bodygt lt/htmlgtltx
  sltemplategt
• ltxsltemplate match"book"gt ltpgt ltbgtltxslvalue-of
  select"title" /gtlt/bgt     by ltxslvalue-of
  select"author /gt . ltxslvalue-of
  select"published /gt lt/pgtlt/xsltemplategt
  lt/xslstylesheetgt

Transformed Document
lthtmlgtltbodygt     ltpgt ltbgtThe Fellowship of the
Ringlt/bgt     by J.R.R. Tolkien. 1963 lt/pgt
lt/bodygt lt/htmlgt