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Introduction to XSL: Creating Dynamic XML/XSL Web Pages

This lesson focuses on the fundamentals of XSL (XML Stylesheet Language) and its application in web development. Learn how to create simple XML/XSL web pages, understand XPath notation, and utilize essential XSL tags such as `<xsl:value-of>`, `<xsl:attribute>`, `<xsl:for-each>`, and `<xsl:if>`. Gain the skills to extract and display XML data, make your web content dynamic, and process XML data conditionally. By the end of this lesson, you will be equipped to transform XML documents into rich web content through XSLT.

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Introduction to XSL: Creating Dynamic XML/XSL Web Pages

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  1. Unit 3 — Advanced Internet Technologies Lesson 11 — Introduction to XSL

  2. Objectives • Create simple XML/XSL Web Pages. • Understand what an Xpath is and how to use it. • Use the <xsl:value-of> tag to extract and display XML data. • Use the <xsl:attribute> tag to make Web content dynamic. Advanced Internet Technologies

  3. Objectives (cont.) • Use the <xsl:for-each> tag to display XML data repetitively. • Use the <xsl:if> tag for conditional XML data processing. Advanced Internet Technologies

  4. XSL Basics • XSL stands for XML Stylesheet Language. • XSL was designed to be a companion technology to XML. Advanced Internet Technologies

  5. Hello World—Again • XSL documents are called stylesheets. • The purpose of XSL stylesheets is to define how XML data should be displayed in a Web browser. Advanced Internet Technologies

  6. Hello World—Again (cont.) • The XSL stylesheet for a particular XML document is identified by an XML directive tag. <?xml-stylesheet type=“text/xsl” href=“[URL]”?> Advanced Internet Technologies

  7. Hello World—Again (cont.) • All XSL stylesheets must include an <xsl:stylesheet> tag and an <xsl:template> tag. • The <xsl:stylesheet> tag identifies the XML namespace to use. • The <xsl:template> tag identifies the root node of the corresponding XML document. Advanced Internet Technologies

  8. XSL Transformations • Combining an XML document with an XSL stylesheet is called transforming it. • The resulting Web page is called an XML Stylesheet Language Transformation (XSLT). • The <xsl:value-of> tag extracts a data value from an XML file and displays it. Advanced Internet Technologies

  9. Understanding Xpaths • An Xpath is a notational convention used to identify a particular data element in an XML document. • Xpaths can be absolute or relative. Advanced Internet Technologies

  10. Text Strings in XSL • Placing arbitrary text strings in XSL stylesheets can cause syntax errors. • Static text strings should be enclosed within <xsl:text> and </xsl:text> tags. <xsl:text>Hello XSL World!</xsl:text> Advanced Internet Technologies

  11. XSL Tag Attributes • Static XSL tag attributes must follow the same syntax rules as XML and XHTML tag attributes. • XSL allows tag attributes to be added dynamically with the <xsl:attribute> tag. • Dynamic attribute values can be extracted and set with the <xsl:value-of> tag. Advanced Internet Technologies

  12. XSL Conditional Tags • All programming languages include “if” statements. • XSL supports conditional processing with the <xsl:if> tag. • The condition is specified in the test attribute of the <xsl:if> tag. • <xsl:if> tags can determine whether a particular XML data element is present or not. Advanced Internet Technologies

  13. Summary • You created simple XML/XSL Web pages. • You understand what an Xpath is and how to use it. • You used the <xsl:value-of> tag to extract and display XML data. • You used the <xsl:attribute> tag to make Web content dynamic. Advanced Internet Technologies

  14. Summary (cont.) • You used the <xsl:for-each> tag to display XML data repetitively. • You used the <xsl:if> tag for conditional XML data processing. Advanced Internet Technologies

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