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XSLT Design Patterns

XSLT Design Patterns. Stylesheet Design Patterns Ref: XSLT by Michael Kay ISBN:1-961005-06-7. Four common design patterns for XSLT Stylesheets The majority of stylesheets fall into four major categories: Fill-in-Blank Stylesheets Navigational stylesheets Rule-based stylesheets

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XSLT Design Patterns

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  1. XSLT Design Patterns

  2. Stylesheet Design PatternsRef: XSLT by Michael KayISBN:1-961005-06-7 • Four common design patterns for XSLT Stylesheets • The majority of stylesheets fall into four major categories: • Fill-in-Blank Stylesheets • Navigational stylesheets • Rule-based stylesheets • Computational stylesheets

  3. Stylesheet Design Patterns • Fill-in-Blank Stylesheets: • The template looks largely like a standard HTML file, sprinkled with a few extra control statements. • Extra tags are used to retrieve variable data and insert it at a particular point in the HTML data page. • The stylesheet has the same structure as the desired output. • Fixed content is included directly in the stylesheet as text. • Repeated sections (like rows in a table) can be enclosed by <xsl:for-each> tags.

  4. Catalog.xml <?xml version="1.0"?> <?xml-stylesheet type="text/css" href="booklists.css" ?> <BookCatalog> <Book> <Title>Billions Of Stars</Title> <Author>Susan Boggs</Author> <Date>1983</Date> <ISBN>1-5555-555-2</ISBN> <Publisher>Anderson-Wells</Publisher> </Book> <Book> <Title>Adventures Of Freddie the Frog</Title> <Author>John Smith</Author> <Date>1977</Date> <ISBN>0-444-4444-4</ISBN> <Publisher>Kidder Publishing Co.</Publisher> </Book> </BookCatalog> Booklists.css BookCatalog {display:block;border:solid blue} Book {display:block} Title { display:block; font-family:Arial;color:Red } Author {display:block } Date,ISBN { display:none } Publisher { display: block; font-style:italic } Example 1

  5. Example 2 - Office.xml <?xml version="1.0"?> <officepersonnel> <person> <name> Mary Jones </name> <title> CEO </title> <reports> <person> <name> Susan Mills </name> <title> Director </title> <reports> <person> <name> John Deen </name> <title> Engineer </title> </person> </reports> </person> <person> <name>David Smith </name> <title> Director </title> <reports> <person> <name> Joan Mist </name> <title> Engineer </title> </person> </reports> </person> </reports> </person> </officepersonnel>

  6. Example2 - Office.xsl <?xml version="1.0"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:template match="/"> <html><head><title> Management </title></head> <body> <table border="2" cellpadding="5"> <tr> <th>Name></th> <th>Title</th> <th> Reports To </th> </tr> <xsl:for-each select="//person"> <tr> <td><xsl:value-of select="name"/></td> <td><xsl:value-of select="title"/></td> <td><xsl:value-of select="ancestor::person[1]/name"/></td> </tr> </xsl:for-each> </table> </body> </html> </xsl:template> </xsl:stylesheet>

  7. Stylesheet Design Patterns • Navigational Stylesheets: • Is essentially output-oriented. • Named templates can be used as subroutines to perform some of the commonly-needed tasks. • Looks more like a conventional procedural program with variables, conditional statements, loops and subroutine calls. • Often used to produce reports on data-oriented XML documents, where the structure of the source document is regular and predictable.

  8. Example • Example on slide 9 • The example shows BookSales.xml and BookSales.xsl that generates an HTML output showing book sales by month.

  9. BookSales.xml <?xml version="1.0"?> <?xml-stylesheet type="text/xsl" href="011231.xsl"?> <sales> <summary> <heading>Book Store</heading> <subhead>Sales Report</subhead> <description>Sales Report for two months</description> </summary> <data> <month><name>January 2002</name> <week number="1" books_sold="1000" /> <week number="2" books_sold="2000" /> <week number="3" books_sold="3000" /> <week number="4" books_sold="4000" /> </month> <month> <name> April 2002</name> <week number="1" books_sold="700" /> <week number="2" books_sold="2000" /> <week number="3" books_sold="1000" /> <week number="4" books_sold="5000" /> </month> </data> </sales> BookSales.xsl <?xml version="1.0"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:output method="html"/> <xsl:template match="/"> <HTML> <BODY> <xsl:variable name="Space" select="' '"/> <xsl:for-each select="//data/month"> <br/><xsl:value-of select="name"/> <xsl:value-of select="$Space"/> <xsl:value-of select="format-number(sum(week/@books_sold), '###,###')"/> </xsl:for-each> </BODY> </HTML> </xsl:template> </xsl:stylesheet> Example

  10. Stylesheet Design Patterns • Rule-based Stylesheets: • Consists primarily of rules describing how different features of the source document should be processed. • The stylesheet is not structured according to the desired output layout. • Makes minimal assumptions about the structure of the source or the result documents. • Are most useful when processing source documents whose structure is flexible or unpredictable, or which may change a lot in the future.

  11. Example • Example shown on slides 12,13 and 14. • In this example, the stylesheet, BookCatalog.xsl generates a file called BookCatalog.xml (slide 14) from the input file, ProductCatalog.xml (on slide 12), using template rules.

  12. Example – ProductCatalog.xml <?xml version="1.0"?> <catalog> <product code="1234" category="tools"> <description>Hammer</description> <weight units="lbs">0.5</weight> <price>12.00</price> </product> <product code="0000" category="tools"> <description>Nut</description> <weight units="lbs">0.1</weight> <price>2.00</price> </product> <product code="7777" category="tools"> <description>Bolt</description> <weight units="lbs">0.1</weight> <price>1.00</price> </product> <book> <title>Cosmos</title> <author >Sagan</author> </book> <book> <title>XML Made Easy</title> <author >Joe Bloggs</author> </book> </catalog>

  13. <?xml version="1.0"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:output method="xml"/> <xsl:template match="/"> <xsl:apply-templates/> </xsl:template> <xsl:template match="catalog"> <xsl:element name="BookCatalog"> <xsl:apply-templates/> </xsl:element> </xsl:template> <xsl:template match="book"> <xsl:element name="book"> <xsl:apply-templates/> </xsl:element> </xsl:template> <xsl:template match="title"> <xsl:element name="title"> <xsl:value-of select="."/> </xsl:element> </xsl:template> <xsl:template match="author"> <xsl:element name="author"> <xsl:value-of select="."/> </xsl:element> </xsl:template> <xsl:template match="text()"> </xsl:template> </xsl:stylesheet> BookCatalog.xsl

  14. BookCatalog.xml <?xml version="1.0" encoding="utf-8"?> <BookCatalog><book><title>Cosmos</title><author>Sagan</author></book><book><title>XML Made Easy</title><author>Joe Bloggs</author></book> </BookCatalog>

  15. Stylesheet Design Patterns • Computational Stylesheets: • Are the most complex of the four design patterns. • They are used when there is a need to generate nodes in the result tree that do not correspond directly to nodes in the source tree. • Examples: • A comma-separated list of items in the source are to be displayed as bulleted list of output. • Using complex aggregation of data • Use functional programming concepts and recursion to accomplish the tasks.

  16. Examplecalc.xsl <?xml version="1.0"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:output method="html"/> <xsl:template match="/"> <html><head><title>Calculation</title></head> <body> 16 / 2 = <xsl:variable name="result"> <xsl:call-template name="NumDiv2"> <xsl:with-param name="N" select="16"/> </xsl:call-template> </xsl:variable> <xsl:value-of select="$result"/> </body> </htmlL> </xsl:template> <xsl:template name="NumDiv2"> <xsl:param name="N"/> <xsl:value-of select="$N div 2"/> </xsl:template> </xsl:stylesheet>

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