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The XSLT Language
 XML syntax.
Benets
reuse of XML tools for processing XSLT programs (or stylesheets).
In practice Visual development tools needed to avoid typing angle brackets.
 freeofside-eects, i.e.obtainthesameresultregardlessoftheorder/numberofexecution
of the statements.
Benets
Useful for progressive rendering of large XML documents.
In practice a value of a variable can not be updated.
 processing described as a set of independent pattern matching rules.
Benets
XSLT - a declarative language.
similar to CSS, but much more powerful.
In practice a rule species what output should be produced
when particular patterns occur in the input.
 dynamically-typed language.
types are associated with values rather than with variables, like JavaScript.
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Data Types in XSLT
 ve data types available: boolean, number, string, node-set, external object.
 addition with XSLT 1.1: result tree fragment (RTF).
 implicit conversion is generally carried out when the context requires it.
 explicit conversion with functions boolean, number, string.
From/To
boolean
number
string
node-set
external object
boolean
n.app.
false !0
false! ’false’
n.a.
n.a.
true! 1
true ! ’true’
number
0!false
n.app.
decimal
n.a.
n.a.
other ! true
string
null! false
decimal
n.app.
n.a.
n.a.
other ! true
node-set
empty!false
string()
stringvalue
n.app.
n.a.
other ! true
function
ofrst node
external
n.a.
n.a.
n.a.
n.a.
n.app.
object
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XSLT variables & parameters
Variables
 global variables - accesible throughout the whole stylesheet.
 local variables - available only within a particular template body.
 variable name and value dened with XSLT element <xsl:variable>, e.g.
<xsl:variable name=’’sum’’ value=’’0’’/>
 can be referenced in XPath expressions as $sum.
Parameters
 global parameters - set from outside the stylesheet, e.g. command line, API.
dened with XSLT element <xsl:param>.
 local parameters - available onlywithin a template.
dened with XSLT element <xsl:with-param>.
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XPath Expressions
 evaluated in a context, consisting of a static and dynamic context.
 static context - depends on where the expression appears.
{ set of namespace declarations in force at the point where the expression is written.
{ set of variable declarations in scope at the point where the expression is written.
{ set of functions available to be called.
{ base URI of the stylesheet element containing the expression.
for document() function.
 dynamic context - depends on the processing state at the time of expression evaluation.
{ current values of the variables in scope.
{ current location in the source tree, i.e.
{ current node - the node currently being processed.
{ context node - dierent from previous only for qualiers inside expressions.
{ context position - position in the current node list.
{ context size - size of the current node list.
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Stylesheet Structure
 <xsl:stylesheet> and <xsl:transform> elements.
the outermost elements of any stylesheet.
 <?xsl:stylesheet?> processing instruction.
used within an XML source to identify the stylesheet that should be used to process it.
 stylesheet modules, using
{ <xsl:include> - textual inclusion of the referenced stylesheet module.
Example( Chapter 03): sample.xml, principal.xsl, date.xsl, copyright.xsl
{ <xsl:import>-thedenitionsintheimportedmodulehavelowerimportprecedence.
 embedded stylesheets - inluded within another XML document,
typically the document whose style it is dening.
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You can also update, remove, and add metadata. List<EXIFField> exifMetadata = collection.ExifFields; You can also update, remove, and add metadata.
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projects. Basically, you can use robust APIs to select a PDF page, define the text character position, and remove it from PDF document.
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XSLT Elements
 dene template rules and control the way they are invoked:
<xsl:template>, <xsl:apply-templates>, <xsl:call-template>
 denethestructureofastylesheet: <xsl:stylesheet>,<xsl:include>,<xsl:import>
 generate output: <xsl:value-of>, <xsl:element>, <xsl:attribute>, <xsl:text>,
<xsl:comment>, <xsl:processing-instruction>
 dene variables and parameters: <xsl:variable>, <xsl:param>, <xsl:with-param>
 copy information from the source to the result: <xsl:copy>, <xsl:copy-of>
 conditional processing and iteration:
<xsl:if>, <xsl:choose>, <xsl:when>, <xsl:otherwise>, <xsl:for-each>
 sort and number: <xsl:sort>, <xsl:number>
 control the nal output format: <xsl:output>, <xsl:document>
Finally an Example Break :-)
 XSLerator at IBM AlphaWorkshttp://www.alphaworks.ibm.com/tech/xslerator
 generate XSLT transformations from mappings dened using a visual interface.
 Input examples from Chapter 4.
XSLT Design Patterns
repertoire of programming techniques in XSLT which were found useful.
 Fill-in-the blanks stylesheets.
 Navigational stylesheets.
 Rule-based stylesheets.
 Computational stylesheets.
Fill-in-the-blanks Stylesheets
 the template looks like a standard HTML le.
 addition of extra tags used to retrieve variable data.
 useful for non-programmers with HTML authoring skills.
 useful when the stylesheet has the same structure as the desired output.
 xed content included as text or literal result elements.
 variablecontent includedbymeansof <value-of>instructions, thatextracttherelevant
data from the source.
 similar to a wide variety of proprietary templating languages.
 Example: orgchart.xml, orgchart.xsl (Chapter 9).
table with one row perperson,withthree columns forperson’sname, title, and the name
of the boss.
Navigational Stylesheets
 still essentially output-oriented.
 use named templates as subroutines to perform commonly-needed tasks.
 use variables to calculate values needed in more than one place.
 looks very like a conventional procedural program with variables, conditional statements,
loops, and subroutine calls.
 often used to produce reports on data-oriented XML, where the structure is regular and
predictable.
 Example: booklist.xml, booksales.xsl (Chapter 9).
report on the total number of sales for each publisher.
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