Intermediate XSLT

1

• Intermediate XSLT
• Bob DuCharme
• www.snee.com/bob
• bob_at_snee.com
• these slides www.snee.com/xml
• 1.0

2
Outline

• Variables and parameters
• Named templates and parameters
• xslfor-each and looping
• XSLT extensions and EXSLT
• Using keys for faster lookups
• XSLT and browsers

3
Variables

•       xmlnsxsl"http//www.w3.org/1999/XSL/Transf
  orm"
• John
•   Congratulations, 
•   
•   , you are a winner!
•   
• Input document
•     
• Output
•     Congratulations, John, you are a winner!

4
Passing Parameters to Stylesheets

•       xmlnsxsl"http//www.w3.org/1999/XSL/Transf
  orm"
• John
•   Congratulations, 
•   
•   , you are a winner!
•   
• Same input document, same result, but when we
  override the default parameter value
• C\saxon temp.xml test.xsl winnerNameJane

5
Named Templates

•   
•   
•   
•   

6
Passing Parameters to Named Templates

•   
•     h4
  
•     
•       
•     
•   
•   
•     
•       
• name"headerElement"h1
  
•     
•   
•   
•     
•       
• name"headerElement" select"'h2'"/
•     

7
Iterating across a set of nodes

• 3
• 10
• 4
• 20
• 5
• xmlnsxsl"http//www.w3.org/1999/XSL/Transfor
  m"
• output

8
Repetition

• 1
• -
• select"howMany - 1"/

9
Testing the recursive template rule

• Print 1 hyphen
• Print 20 hyphens
• Print 0 hyphens

10
Recursive template rule result

• Print 1 hyphen
• -
• Print 20 hyphens
• --------------------
• Print 0 hyphens

11
XSLT Extension functions

• xmlnsxsl"http//www.w3.org/1999/XSL/Transfo
  rm"
• xmlnssaxon"http//saxon.sf.net/"
  

12
Testing the extension function

• Source document
• test
• Result
• /a
• /a/b1
• /a/b2
• /a/b2/c1
• test
• /a/b3

13
Extension elements (and attributes)

• xmlnsxsl"http//www.w3.org/1999/XSL/Transform
  "
• xmlnssaxon"http//saxon.sf.net/"
• extension-element-prefixes"saxon"
• saxonassignable"yes"/
• The value of i is select"i"/

14
Extension element test output

• The value of i is 0
• The value of i is 1
• The value of i is 2
• The value of i is 3
• The value of i is 4
• The value of i is 5
• The value of i is 6
• The value of i is 7
• The value of i is 8
• The value of i is 9

15
Checking for extension support (option 1)

• The value of i is
• Your XSLT processor doesn't
• support saxonwhile.

16
Checking for extension support (option 2)

• "
• The value of i is select"i"/
• Your XSLT processor doesn't
  support
• saxonwhile.
• checking for extension function support
• function-available()

17
EXSLT

• Saxon documentation on its extensions
• Before using a Saxon extension, check whether
  there is an equivalent EXSLT extension
  available. EXSLT extensions are more likely to be
  portable across XSLT processors.
• http//www.exslt.org

18
Some EXSLT extensions (pt 1)

• xmlnsxsl"http//www.w3.org/1999/XSL/Transfo
  rm"
• xmlnsexsl"http//exslt.org/common"
• xmlnsmath"http//exslt.org/math"
• xmlnsdate"http//exslt.org/dates-and-times"
  
• exslobject-type(3)
• exslobject-type('potrzebie')
• bie')"/
• exslobject-type(2 gt 1)
• 1)"/

19
Some EXSLT extensions (pt 2)

• mathconstant('PI',4)
• 
  
• mathconstant('PI',12)
• mathsqrt(256)
• datedate-time
• dateday-name

20
EXSLT demo result

• exslobject-type(3)
• number
• exslobject-type('potrzebie')
• string
• exslobject-type(2 gt 1)
• boolean
• mathconstant('PI',4)
• 3.1415
• mathconstant('PI',12)
• 3.141592653589
• mathsqrt(256)
• 16
• datedate-time
• 2005-06-25T112412-0400
• dateday-name
• Saturday

21
Declaring and using lookup keys

• we have
• yellow
• blue
• orange
• green
• oxford
  button-down
• poly blend, straight
  collar
• monogrammed, tab
  collar
• we want
• blue oxford button-down
• yellow poly blend, straight collar

22
Without keys

• xmlnsxsl"http//www.w3.org/1999/XSL/Transfo
  rm"
• select"_at_colorCode"/
• select"/shirts/colors/color_at_cid
  shirtColorCode"/
• sltext

23
With keys

• xmlnsxsl"http//www.w3.org/1999/XSL/Transfo
  rm"
• use"_at_cid"/
• ode)"/

24
How key lookup works

25
More lookups (part 1)

• xmlnsxsl"http//www.w3.org/1999/XSL/Transform"
  
• use"_at_cid"/
• use"."/
• c4
• colorKeyble
• Looking up the color name with the color ID
• c3's color y','c3')"/
• c4's color y',testVar)"/
• c8's color y','c8')"/
• c7's colors

26
More lookups (part 2)

• Looking up the color ID with the color name
• blue's cid 'blue')/_at_cid"/
• black's cid black')/_at_cid"/
• gray's cid 'gray')/_at_cid"/

27
More lookups result

• Looking up the color name with the color ID
• c3's color red
• c4's color blue
• c8's color
• c7's colors
• orange green
• Looking up the color ID with the color name
• blue's cid c4
• black's cid c2
• gray's cid

28
Muenchian Grouping

• xmlnsxsl"http//www.w3.org/1999/XS
  L/Transform"
• use"_at_project"/
• "filecount(. key('files-by-project',
  _at_project)1) 1"
• /
• t', _at_project)"
• ,
• 
  bytes

29
Muenchian Grouping result

• jupiter
• gadabout.pas,685 bytes
• kwatz.xom,43 bytes
• potrzebie.dbf,1102 bytes
• mars
• schtroumpf.txt,389 bytes
• swablr.eps,4313 bytes
• ummagumma.zip,2441 bytes
• neptune
• batboy.wks,424 bytes
• mondegreen.doc,1993 bytes
• paisley.doc,988 bytes

30
Web Browsers and XSLT

• W3C Recommendation "Associating Style Sheets
• with XML documents"
• (http//www.w3.org/TR/xml-stylesheet) shows how
• type"text/xsl" ?
• 2
• 11
• 100
• -5

31
Web Browsers and XSLT (part 1)

• xmlnsxsl"http//www.w3.org/1999/XSL/Transform
  "
• Squares
• body font-family arial,helvetica
• h1 font-size 14pt
• p font-size 10pt
• Squares

32
Web Browsers and XSLT (part 2)

• The square of
• is
• value"/.
• You could create your HTML like this
• saxon -o numbers.html numbers.xml
  squareAsHTML.xsl

33
XSLT 2.0

• Lots more built-in functions
• Writing your own functions
• Regular expressions
• Grouping output by values
• Tokenizing strings
• Typing awareness