Xslt by asfak mahamud

Apr 10, 2023Apr 10, 2023 11

XSLTXSLT

Md. Asfak MahamudMd. Asfak Mahamud

Associate Software EngineerAssociate Software EngineerKAZ Software Ltd.KAZ Software Ltd.

Dhaka, BangladeshDhaka, Bangladesh

February 19, 2008February 19, 2008

Apr 10, 2023 2

AgendaAgenda

► TrailerTrailer

► CastCast XMLXML XPathXPath XSL/XSLTXSL/XSLT

► DirectorDirector XSLT ProcessorsXSLT Processors Java APIJava API

► ProducerProducer TransformationTransformation

► ProductionProduction Html/XHtmlHtml/XHtml XMLXML TextText

► DiscussionDiscussion

James Stewart Donna Reed Lionel Barrymore

Frank Capra

It’s Wonderful Life

Liberty Film Inc.

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AgendaAgenda

► TrailerTrailer

Frank Capra

Liberty Film Inc.

Apr 10, 2023 4

XSLTprocessor

Trailer (continued)Trailer (continued)

hello.xml

hello.xsl

hello.html

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XSLTprocessor

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Transform.java

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Streamsource of XSL File

XSL File

StreamSource of XML File

XML File

transformer

StreamResultof Html File

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Streamsource of XSL File

XSL File

StreamSource of XML File

XML File

Html FileStreamSource

of XML File

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TransformerFactory tFactory = TransformerFactory.newInstance();

StreamSource xslStreamSource = new StreamSource(xslDoc);

Transformer transformer = tFactory.newTransformer(stylesource);

StreamSource xmlStreamSource = new StreamSource(new File(xmlDoc));

StreamResult htmlStreamResult = new StreamResult(new FileOutputStream(htmlDoc));

transformer.transform(xmlStreamSource, htmlStreamResult);

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AgendaAgenda

► TrailerTrailer

Frank Capra

Liberty Film Inc.

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CastCast XML XML

► stands for Estands for EXXtensible tensible MMarkup arkup LLanguage.anguage.► was designed to was designed to transporttransport and and storestore data. data.

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CastCast XML XML

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CastCast XML XML

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CastCast XML XML with CSSwith CSS

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CastCast XML XML with XSLwith XSL

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CastCast

XPathXPath

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CastCast XPath XPath

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CastCast

XSL/XSLTXSL/XSLT

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CastCast XSL/XSLT XSL/XSLT

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►XSLT elements………………..XSLT elements………………..

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CastCast XSL/XSLT XSL/XSLT FunctionsFunctions

• For the functions required for XPath 2.0, XQuery 1.0 and XSLT 2.0.

http://www.w3schools.com/xpath/xpath_functions.asp

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• Simplest

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• Adding some style

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• use of <xsl:apply-templates> element

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• Getting location paths……..

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► mode in <xsl:apply-templates>mode in <xsl:apply-templates>

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► If we need variable and If we need variable and ► for loopfor loop

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► If we need conditionsIf we need conditions

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► <xsl-apply-imports> works only for templates imported with xsl:import, not <xsl-apply-imports> works only for templates imported with xsl:import, not for templates included with xsl:includefor templates included with xsl:include

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1.1. Extension ElementsExtension Elements

2.2. Extension FunctionExtension Function

3.3. Fallback ProcessingFallback Processing

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Two Important Functions:

Boolean element-available(string)

Boolean function-available(string)

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CastCast XSL/XSLT XSL/XSLT Extention-Elements Extention-Elements

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Example: Generating multiple output file

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CastCast XSL/XSLT XSL/XSLT Extention FunctionExtention Function

► If we want to compute a path expression on the flyIf we want to compute a path expression on the fly

<xsl:variable name="element">foo/bar</xsl:variable><xsl:variable name="element">foo/bar</xsl:variable>

wrong: wrong: <xsl:apply-templates select="$element"/> <xsl:apply-templates select="$element"/>

► saxon:evaluate() extension function:saxon:evaluate() extension function:

<xsl:apply-templates select="<xsl:apply-templates select="saxon:evaluatesaxon:evaluate($element)"/>($element)"/>

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To write a stylesheet that will work with multiple XSLT processors?

<xsl:stylesheet version="1.0" xmlns:xsl=“http://www.w3.org/1999/XSL/Transform”

xmlns:redirect="org.apache.xalan.xslt.extensions.Redirect"

xmlns:saxon="http://icl.com/saxon"

xmlns:xt="http://www.jclark.com/xt"

extension-element-prefixes="redirect saxon xt">

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Writing extensions in other languages

<lxslt:component prefix="javascript-extension“ functions="cos sin toRadians"> <lxslt:script lang="javascript"> function cos(d) { return Math.cos(d); } function sin(d) { return Math.sin(d); } function toRadians(d) { return d * Math.PI / 180; } </lxslt:script>

</lxslt:component>

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Fallback Processing

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AgendaAgenda

► TrailerTrailer

Frank Capra

Liberty Film Inc.

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DirectorDirector XSLT Processors XSLT Processors

► Apache XalanApache Xalanhttp://xml.apache.org/xalanhttp://xml.apache.org/xalan

► SAXONSAXONhttp://saxon.sourceforge.nethttp://saxon.sourceforge.net

► Microsoft’s XML Parser 4.0 (MSXML)Microsoft’s XML Parser 4.0 (MSXML)http://www.microsoft.com/xmlhttp://www.microsoft.com/xml

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DirectorDirector Java API Java API

► JDK 1.4 contains all necessary classesJDK 1.4 contains all necessary classes javax.xml.transform package.javax.xml.transform package.

► Lower versions require downloading XSLT processor and SAX Lower versions require downloading XSLT processor and SAX parser. parser.

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ProducerProducer Transformation Transformation

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AgendaAgenda

► TrailerTrailer

Frank Capra

Liberty Film Inc.

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ProductionProduction

► Stage setup and action !!Stage setup and action !!

Let’s see some demos…………Let’s see some demos…………

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AgendaAgenda

► TrailerTrailer

Frank Capra

Liberty Film Inc.

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DiscussionDiscussion

► Something from XSLT 2.0 Something from XSLT 2.0 GroupingGrouping Function DefinitionsFunction Definitions Result DocumentsResult Documents TypingTyping

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Discussion Discussion XSLT 2.0 - GroupingXSLT 2.0 - Grouping

<paper> <title>XML and PDF in Publishing Workflows</title> <author>Myers, Charles</author></paper><paper> <title>On the Way to XML</title> <author>Parsons, Jonathan</author> <author>Caisley, Phil</author></paper>

<author> <name>Caisley, Phil</name> <paper>On the Way to XML</paper></author><author> <name>Myers, Charles</name> <paper>XML and PDF in Publishing Workflows</paper></author><author> <name>Parsons, Jonathan</name> <paper>On the Way to XML</paper></author>

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Discussion Discussion XSLT 2.0 - GroupingXSLT 2.0 - Grouping

► Usually Muenchian Method (keys) in XSLT 1.0 is used.Usually Muenchian Method (keys) in XSLT 1.0 is used.

► XSLT 2.0 has XSLT 2.0 has <xsl:for-each-group><xsl:for-each-group> select select attribute identifies items to groupattribute identifies items to group grouping by value calculates grouping keygrouping by value calculates grouping key

►group-by group-by groups all itemsgroups all items►group-adjacent group-adjacent groups adjacent itemsgroups adjacent items

grouping in sequence identifies start/end of groupgrouping in sequence identifies start/end of group►group-starting-with group-starting-with identifies start of groupidentifies start of group►group-ending-with group-ending-with identifies end of group identifies end of group

Use Use current-group()current-group() to get members of current group, to get members of current group, current-current-grouping-key()grouping-key() to get value for current group to get value for current group

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<paper> <title>XML and PDF in Publishing Workflows</title> <author>Myers, Charles</author></paper><paper> <title>On the Way to XML</title> <author>Parsons, Jonathan</author> <author>Caisley, Phil</author></paper>

<author> <name>Caisley, Phil</name> <paper>On the Way to XML</paper></author><author> <name>Myers, Charles</name> <paper>XML and PDF in Publishing Workflows</paper></author><author> <name>Parsons, Jonathan</name> <paper>On the Way to XML</paper></author>

<xsl:for-each-group select="paper" group-by="author"> <xsl:sort select="current-grouping-key()" /> <author> <name> <xsl:value-of select="current-grouping-key()" /> </name> <xsl:for-each select="current-group()"> <paper> <xsl:value-of select="title" /> </paper> </xsl:for-each> </author>

</xsl:for-each-group>

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Discussion Discussion XSLT 2.0 - Function DefinitionsXSLT 2.0 - Function Definitions

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Discussion Discussion XSLT 2.0 - XSLT 2.0 - Multiple Result DocumentsMultiple Result Documents

► Many XSLT 1.0 processors have extension elements to create Many XSLT 1.0 processors have extension elements to create multiple output documentsmultiple output documents

► XSLT 2.0 has XSLT 2.0 has <xsl:result-document><xsl:result-document>::

<xsl:for-each select="section"> <xsl:result-document href="{@id}.html"> <xsl:apply-templates select="." mode="html" /> </xsl:result-document></xsl:for-each>

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Discussion Discussion XSLT 2.0 - XSLT 2.0 - TypingTyping

► XPath 2.0 is strongly typedXPath 2.0 is strongly typed

the type of a value determines how it is treated by some the type of a value determines how it is treated by some operators (e.g. +, =)operators (e.g. +, =)

if the wrong type of value is passed to a function, you will if the wrong type of value is passed to a function, you will get an errorget an error

► Similarly, in XSLT 2.0:Similarly, in XSLT 2.0: the type of a sort key determines how values are sortedthe type of a sort key determines how values are sorted if the wrong type of value is passed as a parameter to a if the wrong type of value is passed as a parameter to a

template, you will get an errortemplate, you will get an error

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Discussion Discussion XSLT 2.0 - XSLT 2.0 - TypingTyping

► Declare the type of variables and parameters with Declare the type of variables and parameters with asas attributeattribute holds a SequenceTypeholds a SequenceType

► item test plus occurrence indicatoritem test plus occurrence indicator►xs:integer+xs:integer+ means "one or more integers" means "one or more integers"►element()?element()? means "an optional element" means "an optional element"

► Error if value doesn't comply with typeError if value doesn't comply with type

<xsl:function name="math:power"> <xsl:param name="base" as="xs:decimal" /> <xsl:param name="power" as="xs:integer" /> …</xsl:function>

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And at last…………And at last…………

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DiscussionDiscussionXSLT Advantages & DisadvantagesXSLT Advantages & Disadvantages

Advantages:Advantages:► Easy display formatted XML Easy display formatted XML

data in browser.data in browser.

► Easier to modify when XML Easier to modify when XML data format changes than to data format changes than to modify DOM and SAX modify DOM and SAX parsing code.parsing code.

► Can be used with database Can be used with database queries that return XML. queries that return XML.

Disadvantages:Disadvantages:► Memory intensive, Memory intensive,

performance hit.performance hit.

► Difficult to implement Difficult to implement complex business rules.complex business rules.

► Have to learn new Have to learn new language.language.

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ReferencesReferences

► Features of XSLT 2.0Features of XSLT 2.0 Jeni Tennison Jeni Tennison http://www.jenitennison.comhttp://www.jenitennison.com

► Most of the xslt and xpath examples are fromMost of the xslt and xpath examples are from http://www.zvon.orghttp://www.zvon.org

► Above AllAbove All http://www.w3.org/Style/XSL/http://www.w3.org/Style/XSL/ http://www.w3schools.com/xsl/default.asphttp://www.w3schools.com/xsl/default.asp http://www.w3schools.com/xpath/default.asphttp://www.w3schools.com/xpath/default.asp

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Xslt by asfak mahamud

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