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An XML Format for Presence Buddy Lists

An XML Format for Presence Buddy Lists. Speaker: Ching-Chen Chang Date: 2006.12.25. Outline. Introduction to XML XML Format Buddy List XML Format for Buddy Lists Example for Buddy Lists Reference. Introduction to XML(1/2). XML(eXtensible Markup Language)

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An XML Format for Presence Buddy Lists

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  1. An XML Format for Presence Buddy Lists Speaker: Ching-Chen Chang Date: 2006.12.25

  2. Outline • Introduction to XML • XML Format • Buddy List • XML Format for Buddy Lists • Example for Buddy Lists • Reference

  3. Introduction to XML(1/2) • XML(eXtensible Markup Language) • XML is a subset of SGML (Standard Generalized Markup Language) • HTTP、XML、SGML • XML stands for EXtensible Markup Language • XML is a markup language much like HTML • XML was designed to describe data

  4. Introduction to XML(2/2) • XML tags are not predefined. You must define your own tags • XML uses a Document Type Definition (DTD) or an XML Schema to describe the data • XML with a DTD or XML Schema is designed to be self-descriptive • XML is a W3C Recommendation

  5. XML Format • XML Elements are Extensible • Attributes are used to provide additional information about elements. • XML with correct syntax is Well Formed XML. • XML validated against a DTD is Valid XML.

  6. Buddy List • If the buddy List is stored at local hardware, users only can use this computer. • If the buddy List is stored at the remote server, users can use every computer which has the application.

  7. XML Format for Buddy Lists(1/2) • Buddylist Element <!ELEMENT buddylist (title, (group | buddy)* )> • Group Element <!ELEMENT group (title, (group | buddy)* )>

  8. XML Format for Buddy Lists(2/2) • Buddy Element <!ELEMENT buddy (#PCDATA)>  <!ATTLIST buddy href CDATA #REQUIRED                  date CDATA #IMPLIED> • Title Element     <!ELEMENT title (#PCDATA)>

  9. Example for Buddy Lists(1/2) •   <?xml version="1.0"?>  <!DOCTYPE buddylist     PUBLIC "-//IETF//DTD RFCxxxx XBUDDY 1.0//EN" "xbuddy.dtd">  <buddylist>    <title>Buddy list for John Doe</title>    <group><title>Friends</title>      <buddy uri="sip:jane.doe@example.com;method=SUBSCRIBE"           date="959970634">Jane Doe</buddy>      <buddy uri="sip:john.smith.company.com;method=SUBSCRIBE">John           Smith</buddy>    </group>    <group><title>Coworkers</title>      <buddy uri="sip:eric.summer@supersoft.com;method=SUBSCRIBE">Eric           Summer</buddy>      <buddy uri="sip:jim.nielsin@supersoft.com;method=SUBSCRIBE">           Boss - Jim</buddy>    </group>  </buddylist> >

  10. Example for Buddy Lists(2/2) • <?xml version="1.0"?>  <!DOCTYPE buddylist     PUBLIC "-//IETF//DTD RFCxxxx XBUDDY 1.0//EN" "xbuddy.dtd">  <buddylist>    <title>      <p xmlns="http://www.w3.org/1999/xhtml">        <b><i><font size="+1">Important</font></i></b> People      </p>    </title>    <buddy uri="sip:leonhard.euler@math.spbu.ru;method=SUBSCRIBE">      <math xmlns="http://www.w3.org/1998/Math/MathML">        <mrow>          <mrow>            <msup>              <mi>&ExponentialE;</mi>              <mrow>                <mi>π</mi><mo>&InvisibleTimes;</mo><mi>&ImaginaryI;</mi>              </mrow>            </msup>            <mo>+</mo><mn>1</mn>          </mrow>          <mo>=</mo><mn>0</mn>        </mrow>      </math>    </buddy>  </buddylist>

  11. Reference • XML中文規格書http://www.twtec.org.tw/content/application/taipei/cnt.class/index.php?grpid=5&vroot=&cntgrp_ordinal=000200070004&cnt_id=102 • Internet draft--An XML Format for Presence Buddy Lists

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