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XML Stylesheets

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XML Stylesheets Andy Clark What Is It? Extensible Stylesheet Language (XSL) Language for document transformation Transformation (XSLT) Converting XML to another form ... – PowerPoint PPT presentation

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Title: XML Stylesheets

1
XML Stylesheets

Andy Clark

2
What Is It?

Extensible Stylesheet Language (XSL)
Language for document transformation
Transformation (XSLT)
Converting XML to another form
e.g. Use Xalan to convert to text, XML, HTML,
etc
Formatting objects (XSLFO)
Layout of XML document
e.g. Use FOP to convert to PDF, etc
Defined by W3C

3
The Simplest Stylesheet (1 of 2)

Empty XSLT document

01 lt?xml version1.0 encodingUTF-16?gt 02 ltx
slstylesheet xmlnsxslhttp//www.w3.org/1999/XS
L/Transform 03
version1.0gt 04 lt/xslstylesheetgt
4
The Simplest Stylesheet (2 of 2)

Empty XSLT document
Note This will simply copy the text content of
the input document to the output.

01 lt?xml version1.0 encodingUTF-16?gt 02 ltx
slstylesheet xmlnsxslhttp//www.w3.org/1999/XS
L/Transform 03
version1.0gt 04 lt/xslstylesheetgt
5
What Are Its Features?

Features
Templates
Map input patterns to output
Conditionals
Loops
Functions
Extensions

6
Templates

Transformation rules
Selects nodes from input document
Uses XPath expressions
Specifies output
Can be text, XML, HTML (xml with html tags)
Template modes
Allows multiple templates to have same rules
Named templates
Call templates by name

7
Simple Template (1 of 4)

Match document root
ltxsltemplate match/gt
ltHTMLgt
ltBODYgt
ltxslapply-templates selectchild/gt
lt/BODYgt
lt/HTMLgt
lt/xsltemplategt

8
Simple Template (2 of 4)

Match document root
ltxsltemplate match/gt
ltHTMLgt
ltBODYgt
ltxslapply-templates selectchild/gt
lt/BODYgt
lt/HTMLgt
lt/xsltemplategt

9
Simple Template (3 of 4)

Match document root
ltxsltemplate match/gt
ltHTMLgt
ltBODYgt
ltxslapply-templates selectchild/gt
lt/BODYgt
lt/HTMLgt
lt/xsltemplategt

10
Simple Template (4 of 4)

Match document root
ltxsltemplate match/gt
ltHTMLgt
ltBODYgt
ltxslapply-templates selectchild/gt
lt/BODYgt
lt/HTMLgt
lt/xsltemplategt

11
Simple Template (1 of 5)

Match document root
ltxsltemplate match/gt
ltHTMLgt
ltBODYgt
ltxslapply-templates selectchild/gt
lt/BODYgt
lt/HTMLgt
lt/xsltemplategt
ltxsltemplate matchbookgt
ltH1gt ltxslvalue-of selecttitle/gt lt/H1gt
lt/xsltemplategt

12
Simple Template (2 of 5)

Match document root
ltxsltemplate match/gt
ltHTMLgt
ltBODYgt
ltxslapply-templates selectchild/gt
lt/BODYgt
lt/HTMLgt
lt/xsltemplategt
ltxsltemplate matchbookgt
ltH1gt ltxslvalue-of selecttitle/gt lt/H1gt
lt/xsltemplategt

13
Simple Template (3 of 5)

Match document root
ltxsltemplate match/gt
ltHTMLgt
ltBODYgt
ltxslapply-templates selectchild/gt
lt/BODYgt
lt/HTMLgt
lt/xsltemplategt
ltxsltemplate matchbookgt
ltH1gt ltxslvalue-of selecttitle/gt lt/H1gt
lt/xsltemplategt

14
Simple Template (4 of 5)

Match document root
ltxsltemplate match/gt
ltHTMLgt
ltBODYgt
ltxslapply-templates selectchild/gt
lt/BODYgt
lt/HTMLgt
lt/xsltemplategt
ltxsltemplate matchbookgt
ltH1gt ltxslvalue-of selecttitle/gt lt/H1gt
lt/xsltemplategt

15
Simple Template (5 of 5)

Input
Output

01 ltbook isdn1234-5678-90gt 02 lttitlegtCare
and Feeding of Wombatslt/titlegt 03
ltchapter/gt nn lt/bookgt
01 ltHTMLgt 02 ltBODYgt 03 ltH1gtCare and
Feeding of Wombatslt/H1gt 04 lt/BODYgt 05 lt/HTMLgt
16
Conditionals

If statement
ltxslif test'expression'gt ... lt/xslifgt
Switch statement
ltxslchoosegt
ltxslwhen test'expression'gt ... lt/xslwhengt
ltxslotherwisegt ... lt/xslotherwisegt
lt/xslchoosegt
Predicates
foo_at_bar"value"

17
Loops

For statement
ltxslfor-each select'expression'gt
ltxslsort select'expression'/gt
lt/xslfor-eachgt

18
XPath Functions

Node-set functions
e.g. position(), last(), local-name(), etc
String functions
e.g. string(), contains(), substring(), etc
Boolean functions
e.g. boolean(), not(), etc
Number functions
e.g. number(), sum(), round(), etc

19
XSLT Functions

Multiple source documents
e.g. document(document2.xml)
Keys
Number formatting
Additional functions
e.g. current(), system-property(), etc

20
Example Transformation (0 of 14)

Source
Destination

01 ltordergt 02 ltitem codeBK123gt 03
ltnamegtCare and Feeding of Wombatslt/namegt 04
ltprice currencyUSDgt42.00lt/pricegt 05
lt/itemgt 06 lt/ordergt
01 ltHTMLgt 02 ltBODYgt 03 ltTABLE
border1gt 04 ltTRgt ltTHgtItemlt/THgt
ltTHgtPricelt/THgt lt/TRgt 05 ltTRgt 06
ltTDgtBK123 - ltUgtCare and Feeding of
Wombatslt/Ugtlt/TDgt 07 ltTDgt42.00lt/TDgt 08
lt/TRgt 09 lt/TABLEgt 10 lt/BODYgt 11 lt/HTMLgt
21
Example Transformation (1 of 14)

Match ltordergt element

01 ltxslstylesheet xmlnsxslhttp//www.w3.org/19
99/XSL/Transform 02
version1.0gt 03 04 ltxsltemplate
match/ordergt 05 ltHTMLgt 06 ltBODYgt 07
ltTABLE border1gt 08 ltTRgt
ltTHgtItemlt/THgt ltTHgtPricelt/THgt lt/TRgt 09
ltxslfor-each selectitemgt 10
ltxslapply-templates/gt 11
lt/xslfor-eachgt 12 lt/TABLEgt 13
lt/BODYgt 14 lt/HTMLgt 15 lt/xsltemplategt
22
Example Transformation (2 of 14)

Match ltordergt element

Match ltordergt element

Match ltordergt element

Match ltordergt element

Match ltitemgt element

17 ltxsltemplate matchitemgt 18 ltTRgt 19
ltTDgt 20 ltxslvalue-of
select_at_code/gt - 21 ltUgt ltxslvalue-of
selectname/gt lt/Ugt 22 lt/TDgt 23
ltxslapply-templates selectprice/gt 24
lt/TRgt 25 lt/xsltemplategt
27
Example Transformation (7 of 14)

Match ltitemgt element

Match ltitemgt element

Match ltitemgt element

Match ltpricegt element

27 ltxsltemplate matchpricegt 28 ltTDgt 29
ltxslchoosegt 30 ltxslwhen
testtext()JPNgt lt/xslwhengt 31
ltxslotherwisegt lt/xslotherwisegt 32
lt/xslchoosegt 33 ltxslvalue-of
selecttext()/gt 34 lt/TDgt 35
lt/xsltemplategt 36 37 lt/xslstylesheetgt
31
Example Transformation (11 of 14)