XSLT programming examples

1
XSLT programming examples

• Jaana Holvikivi
• EVTEK

2
Recursion xml file

• lt?xml version'1.0'?gt
• lt?xml-stylesheet type"text/xsl"
  href"books.xsl"?gt
• ltlibrarygt
• ltbookgt
• lttitlegtPennies from heavenlt/titlegt
• ltauthorgtMae Westlt/authorgt
• lt/bookgt
• ltbookgt
• lttitlegtMemorieslt/titlegt
• ltauthorgtBertrand Russellt/authorgt
• lt/bookgt
• ltbookgt
• lttitlegtInvestigationslt/titlegt
• ltauthorgtLudwig Wittgensteinlt/authorgt
• lt/bookgt
• lt/librarygt

3
Recursion books.xsl

• lt?xml version"1.0"?gt
• ltxslstylesheet xmlnsxsl"http//www.w3.org/199
  9/XSL/Transform" version"1.0"gt
• ltxsltemplate match"/"gt
• lthtmlgtltbodygt
• ltxslelement name"table"gt
• ltxslapply-templates select"//book"/gt
• lt/xslelementgt
• lt/bodygtlt/htmlgt
• lt/xsltemplategt
• ...continues

4
Recursion (continues)

• ltxsltemplate match""gt
• ltxslif test"count(ancestor) 1"gt
• ltxslelement name"tr"gt
• ltxslapply-templates select"child"/gt
• lt/xslelementgt
• lt/xslifgt
• ltxslif test"count(ancestor) !1"gt
• ltxslelement name"td"gt
• ltxslvalue-of select"."/gt
• lt/xslelementgt
• lt/xslifgt
• lt/xsltemplategt
• lt/xslstylesheetgt

5
Generic process for copying

• lt?xml version"1.0"?gt
• ltxslstylesheet version"1.0" xmlnsxsl"http//ww
  w.w3.org/1999/XSL/Transform"gt
• ltxsloutput method"xml" /gt
• ltxsltemplate match" _at_ processing-instruct
  ion() "gt
• ltxslcopygt
• ltxslapply-templates select" _at_ text
  processing-instruction() "/gt
• lt/xslcopygt
• lt/xsltemplategt
• lt/xslstylesheetgt

6
Variables and parameters the alphabet one by one

• ltxsltemplate name"alphabetTemplate"gt
• ltxslparam name"alphabet" select"
  'ABCDEFGHIJKLMNOPQRSTUVWXYZ' " /gt
• ltxslvariable name"letter"
  select"substring(alphabet, 1, 1)" /gt
• ltxslvariable name"remainder"
  select"substring(alphabet, 2)" /gt
• .
• ltxslif test"remainder"gt
• ltxslcall-template name"alphabetTemplate"/gt
• ltxslwith-param name"alphabet" select"
  remainder " /gt
• lt/xslcall-templategt
• lt/xslifgt
• lt/xsltemplategt

7
Another HTML exampleAn XML document
representing the results of a soccer tournament

• ltresults group"A"gt
• ltmatchgt
• ltdategt10-Jun-1998lt/dategt
• ltteam score"2"gtBrazillt/teamgt
• ltteam score"1"gtScotlandlt/teamgt
• lt/matchgt
• ltmatchgt
• ltdategt10-Jun-1998lt/dategt
• ltteam score"2"gtMoroccolt/teamgt
• ltteam score"2"gtNorwaylt/teamgt
• lt/matchgt
• ltmatchgt
• ltdategt16-Jun-1998lt/dategt
• ltteam score"1"gtScotlandlt/teamgt
• ltteam score"1"gtNorwaylt/teamgt
• lt/matchgt

8
Another HTML example, page 2An XML document
representing the results of a soccer tournament

• ltmatchgt
• ltdategt16-Jun-1998lt/dategt
• ltteam score"3"gtBrazillt/teamgt
• ltteam score"0"gtMoroccolt/teamgt
• lt/matchgt
• ltmatchgt
• ltdategt23-Jun-1998lt/dategt
• ltteam score"1"gtBrazillt/teamgt
• ltteam score"2"gtNorwaylt/teamgt
• lt/matchgt
• ltmatchgt
• ltdategt23-Jun-1998lt/dategt
• ltteam score"0"gtScotlandlt/teamgt
• ltteam score"3"gtMoroccolt/teamgt
• lt/matchgt
• lt/resultsgt

9
A basic style sheet for the soccer results

• ltxsltransform
• xmlnsxsl"http//www.w3.org/1999/XSL/Trans
  form" version"1.0"gt
• ltxsltemplate match"results"gt
• lthtmlgt
• ltheadgtlttitlegt
• Results of Group ltxslvalue-of
  select"_at_group"/gt
• lt/titlegtlt/headgt
• ltbodygtlth1gt
• Results of Group ltxslvalue-of
  select"_at_group"/gt
• lt/h1gt
• ltxslapply-templates/gt
• lt/bodygtlt/htmlgt
• lt/xsltemplategt
• ltxsltemplate match"match"gt
• lth2gt
• ltxslvalue-of select"team1"/gt
  versus ltxslvalue-of select"team2"/gt
• lt/h2gt
• ltpgtPlayed on ltxslvalue-of
  select"date"/gtlt/pgt
• ltpgtResult

10

• A style sheet that computes team standings (part
  1)
• ltxsltransform
• xmlnsxsl"http//www.w3.org/1999/XSL/Transfor
  m"
• version"1.0"gt
• ltxslvariable name"teams" select"//teamnot(.
  precedingteam)"/gt
• ltxslvariable name"matches"
  select"//match"/gt
• ltxsltemplate match"results"gt
• lthtmlgtltbodygt
• lth1gtResults of Group ltxslvalue-of
  select"_at_group"/gtlt/h1gt
• lttable cellpadding"5"gt
• lttrgt
• lttdgtTeamlt/tdgt
• lttdgtPlayedlt/tdgt
• lttdgtWonlt/tdgt

11

• A style sheet that computes team standings (part
  2)
• ltxslfor-each select"teams"gt
• ltxslvariable name"this" select"."/gt
• ltxslvariable name"played"
  select"count(matchesteamthis)"/gt
• ltxslvariable name"won"
• select"count(matchesteam.this
  /_at_score gt team.!this/_at_score)"/gt
• ltxslvariable name"lost"
• select"count(matchesteam.this
  /_at_score lt team.!this/_at_score)"/gt
• ltxslvariable name"drawn"
• select"count(matchesteam.this
  /_at_score team.!this/_at_score)"/gt
• ltxslvariable name"for"
• select"sum(matches/team.current
  ()/_at_score)"/gt
• ltxslvariable name"against"
• select"sum(matchesteamcurrent()
  /team/_at_score) - for"/gt
• lttrgt
• lttdgtltxslvalue-of select"."/gtlt/tdgt
• lttdgtltxslvalue-of select"played"/gtlt/t
  dgt
• lttdgtltxslvalue-of select"won"/gtlt/tdgt

12
A style sheet that computes team standings result

• The data are rearranged and processed

13
Explanations

• ltxslvariable name"teams" select"//teamnot(.pr
  ecedingteam)"/gt
• create a global variable teams (node-set which
  has all team elements, the same element cannot be
  selected twice)
• this node set is processed in the loop on the
  next page
• ltxslfor-each select"teams"gt the dollar sign
  refers to variable teams
• ltxslvariable name"this" select"."/gt
  declare a local variable this, that gets the
  value of the current node
• count(matchesteamthis)
• counts the number of those matches for which it
  is true that the name of this team is in the
  element value
• /_at_score gt team.!this/_at_score
• compare values of score attributes has this
  team more (gt gt) scores than the other !
  means NOT

14
XSL as a functional programming language the
factorial

• lt?xml version"1.0"?gtltxslstylesheet
  xmlnsxsl"http//www.w3.org/1999/XSL/Transform"
  version"1.0"gt
• lt!-- Defining and Calling the Factorial Function
  in XSLT --gtlt!-- A separate file
  factorial-main.xml provides specific arguments
  --gtlt!-- call factorial on selected integer
  argument n --gt
• ltxsltemplate match"/arguments/a1"gt
• lthtmlgtltheadgtlttitlegtfactorial(ltxslvalue-of
  select"."/gt)lt/titlegtlt/headgtltbodygt
• ltxslcall-template name"factorial"gtltxslwith-par
  am name"n" select"."/gtlt/xslcall-templategtlt/bo
  dygt
• lt/htmlgtlt/xsltemplategt

15
XSL as a functional programming language the
factorial, cont.

• ltxsltemplate name"factorial"gtltxslparam
  name"n"/gtltxslchoosegtltxslwhen test"n
  0"gt1lt/xslwhengtlt!-- factorial(0) 1
  --gtltxslwhen test"n gt 0"gt lt!-- factorial(n)
  --gtltxslvariable name"factor"gtltxslcall-templat
  e name"factorial"gtltxslwith-param name"n"
  select"n - 1"/gtlt/xslcall-templategtlt/xslvaria
  blegtltxslvalue-of select"n factor"/gt lt!--
  nfactorial(n-1) --gtlt/xslwhengtlt/xslchoosegtlt/x
  sltemplategt