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XML

XML. Topics: XML and its relation to SGML and HTML Applications of XML. Introduction.  The extraordinary growth of the World Wide Web  The advent of Hypertext Markup Language(HTML)  The limitations of HTML  The introduction of XML  XML and/vs Java.

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XML

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  1. XML

  2. Topics: • XML and its relation to SGML and HTML • Applications of XML

  3. Introduction The extraordinary growth of the World Wide Web  The advent of Hypertext Markup Language(HTML)  The limitations of HTML  The introduction of XML  XML and/vs Java

  4. XML and its relation to SGML and HTML: a discussion of: What is XML?  XML verse SGML  XML verse HTML  Why XML?

  5. XML  XML:Extensible Markup Language.  Developed by:World Wide Web Con. (W3C)  Purpose: industry-specific markup, electronic data exchange  Made up of: elements, which contain either parsed or unparsed data.  DTD: Document type definition

  6. XML file sample <?xml version= '1.0'?> <!DOCTYPE PATIENTRECORD [ <!ELEMENT PATIENTRECORD (PATIENT)*> <!ELEMENT PATIENT (LASTNAME, FIRSTNAME, MEDICAL_HISTORY, PHONE_NO)> <!ELEMENT LASTNAME (#PCDATA)> <!ELEMENT FIRSTNAME (#PCDATA)> <!ELEMENT MEDICAL_HISTORY (#PCDATA)> <!ELEMENT PHONE_NO (#PCDATA)> ]> <PATIENTRECORD> <PATIENT> <LASTNAME>Anderson</LASTNAME> <FIRSTNAME>Robert</FIRSTNAME> <MEDICAL_HISTORY>Flue, june 98</MEDICAL_HISTORY> <PHONE_NO>334-884-9999</PHONE_NO> </PATIENT>

  7. XML Verse SGML SGML: Standard Generalized Markup Language, created in 1986, it is for definition of platform and system independent electronic data, it is flexible and complicated. XML: a subset of SGML, makes SGML easy to use

  8. XML Verse HTML

  9. Applications of XML • As a universal hub for database interchange •  Electronic data exchange between organizations • or applications. •  To distribute a significant proportion of the • processing load from the Web server to the • Web client. (vs Java?)

  10. XML as a universal hub for database interchange Database A Database B Database F Data displayed in XML format Database C Database E Database D

  11. Data display in HTML format can not be used for interchange Database A Database F Database B Data displayed in HTML format Database C Database E Database D

  12. XML for EDI EDI: Electronic Data Interchange  Problem with EDI: Format: X12 and EDIFACT are complicated Cost: expensive  XML for EDI: inexpensive, simple

  13. Mapping between Java Objects and XML Elements PATIENTRECORD PatientRecord PATIENT Patient

  14. Freely available software packages that can be used for experimentation • JDK1.2 • JSDK: Java Servlet Development Kit • XML4j1.1.14: XML Parser • Pi3Web: Web server • Netscape Browser

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