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Perl and XML.pdf Table of Contents Preface ........................................................................................................................................ 1 Assumptions .........................................................................................................................................................1 How This Book Is Organized ...............................................................................................................................1 Resources..............................................................................................................................................................2 Font Conventions..................................................................................................................................................2 How to Contact Us ...............................................................................................................................................2 Acknowledgments ................................................................................................................................................3 Chapter 1. Perl and XML ............................................................................................................ 4 1.1 Why Use Perl with XML? ...............................................................................................................................4 1.2 XML Is Simple with XML::Simple.................................................................................................................4 1.3 XML Processors .............................................................................................................................................7 1.4 A Myriad of Modules .....................................................................................................................................8 1.5 Keep in Mind... ...............................................................................................................................................8 1.6 XML Gotchas .................................................................................................................................................9 Chapter 2. An XML Recap........................................................................................................ 11 2.1 A Brief History of XML...............................................................................................................................11 2.2 Markup, Elements, and Structure ..................................................................................................................13 2.3 Namespaces ..................................................................................................................................................15 2.4 Spacing .........................................................................................................................................................16 2.5 Entities..........................................................................................................................................................17 2.6 Unicode, Character Sets, and Encodings .......................................................................................................19 2.7 The XML Declaration...................................................................................................................................19 2.8 Processing Instructions and Other Markup....................................................................................................19 2.9 Free-Form XML and Well-Formed Documents ............................................................................................21 2.10 Declaring Elements and Attributes ..............................................................................................................22 2.11 Schemas ......................................................................................................................................................22 2.12 Transformations..........................................................................................................................................24 Chapter 3. XML Basics: Reading and Writing.......................................................................... 28 3.1 XML Parsers.................................................................................................................................................28 3.2 XML::Parser .................................................................................................................................................34 3.3 Stream-Based Versus Tree-Based Processing ...............................................................................................38 3.4 Putting Parsers to Work ................................................................................................................................39 3.5 XML::LibXML.............................................................................................................................................41 3.6 XML::XPath .................................................................................................................................................43 3.7 Document Validation....................................................................................................................................44 3.8 XML::Writer.................................................................................................................................................46 3.9 Character Sets and Encodings.......................................................................................................................50 Chapter 4. Event Streams .......................................................................................................... 55 4.1 Working with Streams ..................................................................................................................................55 4.2 Events and Handlers .....................................................................................................................................55 4.3 The Parser as Commodity.............................................................................................................................57 4.4 Stream Applications......................................................................................................................................57 4.5 XML::PYX...................................................................................................................................................58 4.6 XML::Parser .................................................................................................................................................60 Chapter 5. SAX.......................................................................................................................... 64 5.1 SAX Event Handlers.....................................................................................................................................64 5.2 DTD Handlers...............................................................................................................................................70 5.3 External Entity Resolution............................................................................................................................73 5.4 Drivers for Non-XML Sources ......................................................................................................................74 5.5 A Handler Base Class ...................................................................................................................................76 5.6 XML::Handler::YAWriter as a Base Handler Class......................................................................................77 5.7 XML::SAX: The Second Generation.............................................................................................................78 Chapter 6. Tree Processing........................................................................................................ 90 6.1 XML Trees ...................................................................................................................................................90 6.2 XML::Simple................................................................................................................................................91 6.3 XML::Parser's Tree Mode .............................................................................................................................93 6.4 XML::SimpleObject .....................................................................................................................................94 6.5 XML::TreeBuilder........................................................................................................................................96 6.6 XML::Grove .................................................................................................................................................98 Chapter 7. DOM ...................................................................................................................... 100 7.1 DOM and Perl.............................................................................................................................................100 7.2 DOM Class Interface Reference ..................................................................................................................100 7.3 XML::DOM................................................................................................................................................107 7.4 XML::LibXML...........................................................................................................................................109 Chapter 8. Beyond Trees: XPath, XSLT, and More................................................................ 112 8.1 Tree Climbers .............................................................................................................................................112 8.2 XPath ..........................................................................................................................................................114 8.3 XSLT ..........................................................................................................................................................121 8.4 Optimized Tree Processing.........................................................................................................................123 Chapter 9. RSS, SOAP, and Other XML Applications ........................................................... 125 9.1 XML Modules ............................................................................................................................................125 9.2 XML::RSS..................................................................................................................................................126 9.3 XML Programming Tools ...........................................................................................................................132 9.4 SOAP::Lite .................................................................................................................................................134 Chapter 10. Coding Strategies ................................................................................................. 137 10.1 Perl and XML Namespaces .......................................................................................................................137 10.2 Subclassing ...............................................................................................................................................139 10.3 Converting XML to HTML with XSLT ....................................................................................................144 10.4 A Comics Index ........................................................................................................................................151 Colophon ................................................................................................................................ 154

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