Download presentation
Presentation is loading. Please wait.
1
7 September 1999 The Basics of XSLT Assuming a basic knowledge of XML and XML Namespaces Thomas G. Habing Grainger Engineering Library Information Center University of Illinois at Urbana-Champaign 8 July 2005 Slavic Digital Text Workshop Collaborating Partners Worksho
2
What is XSLT “language for transforming XML documents into other XML documents” plus HTML or even plain text Version 1.0 Released 1999. Widely supported by many tools and applications. Working Drafts for version 2.0 Associated with XSL-FO, but different Uses XML syntax Pattern based Template rules (based on XPath) indicate how different elements should be processed For advanced users: Side-effect free, functional programming language 8 July 2005 Slavic Digital Text Workshop
3
Why Transform XML Separating data from presentation
Transform TEI or EAD into HTML for display Transform MARCXML into HTML for display Transform DocBook into XSL-FO and then into PDF Transmitting data between applications Metadata crosswalks, convert FGDC into MARC Convert TEI header elements in simple Dublin Core Extract EAD header into a CSV for import into a database 8 July 2005 Slavic Digital Text Workshop
4
Hello World. Input http://www. softwareag
<?xml version="1.0" encoding="UTF-8"?> <greeting>Hello, world!</greeting> 8 July 2005 Slavic Digital Text Workshop
5
Hello World! Output <html> <head>
<title>Today's greeting</title> </head> <body> <p>Hello, world!</p> </body> </html> 8 July 2005 Slavic Digital Text Workshop
6
Hello World! XSLT Stylesheet
<?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet version="1.0" xmlns:xsl= " <xsl:template match="/"> <xsl:output method="html" encoding="UTF-8"/> <html> <head> <title>Today's greeting</title> </head> <body> <p><xsl:value-of select="greeting"/></p> </body> </html> </xsl:template> </xsl:stylesheet> 8 July 2005 Slavic Digital Text Workshop
7
Hello World! Make it happen
Command line: java -jar saxon.jar hello.xml hello.xsl > hello.html msxsl hello.xml hello.xsl -o hello.html Processing instruction to the client: <?xml-stylesheet type="text/xsl“ href="hello.xsl"?> XML Editor Oxygen, etc. Programmatically Some demos go here… 8 July 2005 Slavic Digital Text Workshop
8
Detailed Tutorials from ZVON
XPath XSLT 8 July 2005 Slavic Digital Text Workshop
9
References http://www.jenitennison.com/xslt/index.html
8 July 2005 Slavic Digital Text Workshop
10
‘Quick and Dirty’ Rendering with XSLT and CSS and a little JavaScript
7 September 1999 ‘Quick and Dirty’ Rendering with XSLT and CSS and a little JavaScript 8 July 2005 Slavic Digital Text Workshop Collaborating Partners Worksho
11
XSLT Where Should It Happen
Client-side IE5+ and Mozilla (Netscape 7+) Can reduce the load on your servers But performance on low-end clients can be BAD Server-side Performance could be a problem on busy servers, serving large, complex documents More control and flexibility over the conversion (metamerge) Offline Preconversion Best performance Not good for dynamic documents (metamerge) 8 July 2005 Slavic Digital Text Workshop
12
How We Use XSLT Most tags are converted to HTML spans with a class attribute equal to the original tag name, i.e. <title> becomes <span class=“title”> <xsl:template match=“*”> <xsl:element name=“span”> <xsl:attribute name=“class”> <xsl:value-of select=“local-name()”/> </xsl:attribute> <xsl:apply-templates/> </xsl:element> </xsl:template> If the tag must be a block element, that is specified in the CSS: span.title {display:block} This improves the modularity of the code 8 July 2005 Slavic Digital Text Workshop
13
How We Use XSLT (cont.) Some tags require special conversion, i.e. <title rend=“bold”> becomes <span class=“title_rend_bold”> <xsl:template match=“title”> <xsl:element name=“span”> <xsl:attribute name=“class”> <xsl:value-of select=“local-name()”/> <xsl:text>_rend_</xsl:text> <xsl:value-of </xsl:attribute> <xsl:apply-templates/> </xsl:element> </xsl:template> CSS: span.title_rend_ital {font-style:italic} span.title_rend_bold {font-weight:bold} 8 July 2005 Slavic Digital Text Workshop
14
How We Use XSLT (cont.) Some elements need to have punctuation added, i.e. <list><item>Nikolai</item><item>Vasilli</item><item>Bob</item></list> becomes Nikolai, Vasilli, Bob. <xsl:template match=“list/item[position() = last()]”> <span><xsl:call-template name=“class-attr”/> <xsl:apply-templates/><xsl:text>.</xsl:text> </span> </xsl:template> <xsl:template match=“list/item[position() != last()]”> <span><xsl:call-template name=“class-attr”/> <xsl:apply-templates/> <xsl:text>, </xsl:text> </span> </xsl:template> 8 July 2005 Slavic Digital Text Workshop
15
How We Use XSLT (cont.) Some elements need their children rearranged i.e. <respStmt><name>Habing</name><resp>Coder</resp></respStmt> becomes Coder: Habing <xsl:template match=“respStmt”> <span><xsl:call-template name=“class-attr”/> <xsl:apply-templates select=“resp”/> <xsl:text>: </xsl:text> <xsl:apply-templates select=“name”/> </span> </xsl:template> ‘Real’ DTDs can require some fairly complex processing. So far XSLT seems to be able to handle nearly every case we have come across However, some cases have required extensions to XSLT 8 July 2005 Slavic Digital Text Workshop
16
How We Use XSLT (cont.) Some elements are converted into HTML elements other than <span> Elements representing figures or images are converted to the <img src=“…”> tag. Elements representing internal links with ID and IDREF attributes are usually converted into <a name=“…”></a> or <a href=“#…”>…</a> tags. Table elements are converted into corresponding HTML <table>, <tr>, or <td> tags. In all cases, a class attribute is added which is the original XML tag name; this is used in the CSS. 8 July 2005 Slavic Digital Text Workshop
Similar presentations
