Extensible Stylesheet Language (XSL) Brian Temple about:XSL • XSL is a language for expressing stylesheets – a language for transforming XML documents – an XML vocabulary for specifying formatting semantics But, why XSL? • Unlike HTML, XML element names have no intrinsic presentation semantics • Builds on prior work of CSS2, DSSSL • Can be extended An Example XML Document <?xml version=“1.0”?> <purchaseOrder orderDate=“1999-10-20”> <shipTo country=“US”> <name>Matthias Hauswirth</name> <street>4500 Brookfield Dr.</street> <city>Boulder</city> <state>CO</state> <zip>80303</zip> </shipTo> <billTo country=“US”> <name>Brian Temple</name> <street>1234 Strasse</street> <city>Boulder</city> <state>CO</state> <zip>80302</zip> </billTo> <comment>Brian pays</comment> <items> <item partNum=“123-AB”> <productName>Porsche</productName> <quantity>1</quantity> <price>129400.00</price> <comment>Need a new one</comment> </item> <item> <productName>Ferrari</productName> <quantity>2</quantity> <price>189000.25</price> <shipDate>1999-05-21</shipDate> </item> </items> </purchaseOrder> Simple XSL Document <?xml version="1.0"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl"> <xsl:template match="/"> <HTML> <BODY> <table border="2" bgcolor="yellow"> <xsl:for-each select="records/purchaseOrder"> <tr> <td><xsl:value-of select="shipTo/name"/></td> <td><xsl:value-of select="comment"/></td> <xsl:for-each select="items/item"> <td><xsl:value-of select="price"/></td> </xsl:for-each> </tr> </xsl:for-each> </table> </BODY> </HTML> </xsl:template> </xsl:stylesheet> Simple XSL Results XSL:CHOOSE <xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl"> <xsl:template match="/"> <HTML> <BODY> <table border="2" bgcolor="yellow"> <xsl:for-each select="records/purchaseOrder"> <tr> <td><xsl:value-of select="shipTo/name"/></td> <td><xsl:value-of select="comment"/></td> <xsl:for-each select="items/item"> <xsl:choose> <xsl:when match=".[price>100]"> <td bgcolor="red"><xsl:value-of select="price"/></td> </xsl:when> <xsl:otherwise> <td><xsl:value-of select="price"/></td> </xsl:otherwise> </xsl:choose> </xsl:for-each> </tr> </xsl:for-each> </table> </BODY> </HTML> </xsl:template> </xsl:stylesheet> XSL:CHOOSE Results Processing a stylesheet Formatting process • Build formatting object tree • Produce refined formatting object tree – mapping from properties to traits • • • • shorthand expansion into individual properties mapping of corresponding properties determining computed values inheritance • Construct area tree The Area Model A Typical Area Tree Fe Fi FO Fum • <doc> <p>This is an <emph>important word</emph> in this sentence that also refers to a <code>variable</code >.</p> </doc> <?xml version='1.0'?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" version='1.0'> ... <xsl:template match="code"> <fo:wrapper font-family="Courier"> <xsl:apply-templates/> </fo:wrapper> </xsl:template> Examples of Formatting Objects • • • • • • • • • • • • • • • • • • • • • • bidi-override block block-container character color-profile conditional-page-master-reference declarations external-graphic float flow footnote footnote-body initial-property-set inline inline-container instream-foreign-object layout-master-set leader list-block list-item list-item-body list-item-label • • • • • • • • • • • • • • • • • • • • • • marker multi-case multi-properties multi-property-set multi-switch multi-toggle page-number page-number-citation page-sequence page-sequence-master region-after region-before region-body region-end region-start repeatable-page-master-alternatives repeatable-page-master-reference retrieve-marker root simple-link simple-page-master single-page-master-reference • • • • • • • • • • • • static-content table table-and-caption table-body table-caption table-cell table-column table-footer table-header table-row title wrapper
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