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XML – An Introduction

XML – An Introduction. What Is XML?. Extensible markup language Encoding objects based on their structure and meaning of content Convergence of three technologies: Document markup Data interchange World wide web. Why XML?. To address HTML limitations

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XML – An Introduction

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  1. XML – An Introduction

  2. What Is XML? • Extensible markup language • Encoding objects based on their structure and meaning of content • Convergence of three technologies: • Document markup • Data interchange • World wide web

  3. Why XML? • To address HTML limitations • Enabling technology for a business web • Next generation web

  4. Basic XML Process Content, structure, meaning XML Document End Result Processing Engine What to do with XML Application SpecificationObject

  5. Processing XML • Parsers • Parsers are commodity items • Two basic types: • Tree based (DOM) • Event based (SAX) • Your applications requirements decide which one to use • Validating parsers

  6. XML Validity • Well-formed is not always enough. • Provides higher level conformance. • Include formal definition of data model. • Document type definition (DTD). • Schema. • A DTD defines a document type.

  7. XSL and XSLT • XSL • XSLT – transformation stylesheet • XSL FO – formatting objects • XSLT XML Document HTML Document XSLT Engine XSLT Style sheet

  8. Very Simple Example <xsl:stylesheet version=“1.0”> <xsl:template match=“person”> <html><p> <xsl:apply-templates/> </p></html> </xsl:template> </xsl:stylesheet> <person type=“fictional”> <name> <first>Peter</first> <last>Pan</last> <feature>flies</feature> </person> XSLT Engine <html><p>PeterPanflies</p></html>

  9. XML Future • Http & XML =. • Soap. • XML-RPC. • Can work across firewalls. • Platform independent. • XML enabled data bases. • XML enabled search engines. • Industry standard XML vocabularies.

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