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XML Overview

XML Overview. Andy Clark. What is XML?. Standard “markup” language for information SGML with 80% functionality but 20% complexity Designed by W3C member companies Extensible Can be used for both documents and messages Unlike HTML, new “tags” can be defined International

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XML Overview

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  1. XML Overview Andy Clark 17 Apr 2002

  2. What is XML? • Standard “markup” language for information • SGML with 80% functionality but 20% complexity • Designed by W3C member companies • Extensible • Can be used for both documents and messages • Unlike HTML, new “tags” can be defined • International • Based on Unicode character set

  3. What XML is Not! • A panacea for broken applications and business processes • Business partners still need to agree on how to communicate • A replacement for traditional relational database systems • Nor does XML require object-oriented databases • A passing fad

  4. HTML But Better… • HTML • Defines “visual” document layout • Paragraphs, images, etc… • Browsers allow liberal use (and abuse) • XML • Defines semantic structure for data • Music collection, financial transaction, etc… • Strict definition for document syntax

  5. An Example in HTML <table border=‘1’> <tr style=‘background:black;color:white’> <th>Item <th>Price </tr> <tr valign=‘top’ style=‘background:silver’> <td>BK123 - <u>Care and Feeding of Wombats</u> <td>$42.00 </tr> </table>

  6. The Same Thing in XML <order> <item code=‘BK123’> <name>Care and Feeding of Wombats</name> <price currency=‘USD’>42.00</price> </item> </order> - <order> - <item code="BK123"> <name>Care and Feeding of Wombats</name> <price currency="USD">42.00</price> </item> </order>

  7. The Business Connection • Protocol independence • Eases intra-business communication • Allows information interchange with partners • Platform independence • Bridges legacy systems to new applications • Open standard • Freedom from data control (e.g. EDI) • Everyone “speaks” the same language

  8. The “Big” Picture: An Example XML XML XML

  9. XML Overview Andy Clark

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