The place of XSLT in the XML family (2/2)
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Simple Transformation Examples with XSLT
 XSLTrace from IBM AlphaWorks
available athttp://www.alphaworks.ibm.com/aw.nsf/download/xsltrace
 allows a user to visually "step through" an XSL transformation,
highlighting the transformation rules as they are red.
 Add the XSLTrace.jar, xml4j.jar, lotusxsl.jar Java archives $CLASSPATH.
 command line: java com.ibm.xsl.xsltrace.XSLTrace <input> <style>
 input: xml and xslt documents from Chapters 1 and 2 from
XSLT Programmer’s Reference, M. Kay. http://www.wrox.com
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The XSLT Processing Model
 usually input, output and XSLT program - well-balanced XML documents,
represented internally as XPath data model/DOM-like trees.
 dierent output formats: xml, html, text.
 multiple inputs via document() XSLT function.
 multiple outputs via <xsl:document> XSLT element.
 multiple programs via <<xsl:include> and <xsl:import> XSLT elements.
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The Supported Information Items
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The Transformation Process
 based on template rules.
 a template rule = template pattern + template body.
<xsl:template match=’’pattern’’> body </xsl:template>
the pattern matches nodes in the source tree.
for the matched nodes, the template body is instantiated.
 template pattern = XPath expression.
 template body = literal result elements + XSLT instructions.
 nd templates that apply to nodes in the source tree.
 more templates for the same nodes ! processing modes or con ict resolution policy.
 no template for nodes ! built-in templates.
 after processing a node, start to process its children:
<xsl:apply-templates>
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Push Processing
How is working?
 a template rule for each kind of node.
 apply templates for children.
 use built-in templates if needed.
Application: similar structure for input and output.
Example
 Chapter 2 from XSLT Programmer’s Reference, M. Kay. http://www.wrox.com
 XML Source: books.xml
 XSLT StyleSheet: books.xsl
Pull Processing
How is working?
 explicitly select and process the required nodes.
<xsl:value-of select=’’pattern’’/>
<xsl:apply-templates select=’’pattern’’/>
<xsl:for-each select=’’pattern’’/>
 greater control over which nodes are to be processed.
Application: very dierent structure for input and output.
Example (Chapter 1)
 XML Source: books.xml
 XSLT StyleSheet: books_pull.xsl
Processing Modes
 for processing the same node in the source tree more than once, but in dierent ways.
 another (not general) possibility: push and pull processing for the same node.
 example: handling the section headings of a book in two dierent ways
{ for the table of contents (mode toc).
<xsl:apply-templates select=’’heading’’ mode=’’toc’’/>
<xsl:template match=’’heading’’ mode=’’toc’’/>
{ inside the body of the document (mode body).
<xsl:apply-templates select=’’heading’’ mode=’’body’’/>
<xsl:template match=’’heading’’ mode=’’body’’/>
Example
 Formatting the XML Specication
 Chapter 10 from XSLT Programmer’s Reference, M. Kay. http://www.wrox.com
 XML Source: REC-xml-19980210.xml XSLT StyleSheets: xmlspec.xsl, xpath.xsl,
xslt.xsl
Con ict Resolution Policy
 more templates with patterns matching the same node in the source tree.
 no processing modes are used.
 appears when several stylesheets are imported, or included.
Solution: each template has a priority
 set by an XSLT instruction.
<xsl:template match=’’pattern’’ priority=’’1’’/>.
 given by the selectivity of its pattern.
Patterns
Default priority
node(), text(), *
-0.5
abc:*
(-0.5 , 0.0)
title, @id
0.0
book[@isbn], para[1]
>0.0
Anumerically higher value indicates a higher priority.
Built-in Templates
 <xsl:apply-templates> is invoked to process a node,
and there is no template rule in the stylesheet that matches that node.
 built-in template rule for each type of node.
Node type
Built-in template rule
root
call <xsl:apply-templates> to process its children.
element
call <xsl:apply-templates> to process its children.
attribute
copy the attribute value to the result tree.
text
copy the text to the result tree.
commment
do nothing.
pi
do nothing.
namespace
do nothing.
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