ICS 101 XML Lecture (Spring 2010)

What is XML?

• Eric Explains XML
• XML: the basics
• XML Design Goals

An Example of an XML Document

<xml version="1.0">
   <book>
      <title>A Tale of Two Cities</title>
      <author>Charles Dickens</author>
   </book>

   <book>
      <title>Tom Sawyer</title>
      <author>Mark Twain</author>
   </book>

   <book>
      <title>The Wonderful Wizard of Oz</title>
      <author>Lyman Frank Baum</author>
   </book>

</xml>

XML in Action: RSS

• RSS = Really Simple Syndication
• RSS readers: IE, Firefox, yahoo, google ...
• RSS publishers:
  • CNN's RSS feeds
  • Reuter's RSS feeds
  • Twitter feeds
  • Twitter:ktlink

XML in Action: FIXML

• FIX: Financial Information Exchange
• FIXML: XML version of FIX
• Enables communication between financial entities like brokerages, banks etc

<FIXML xmlns="http://www.fixprotocol.org/FIXML-4-4" 
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
          xsi:schemaLocation="http://www.fixprotocol.org/FIXML-4-4  ../../schema/fixml-main-4-4.xsd" 
          v="4.4" r="20030618" s="20040109">
<!-- International Business Machines - FIXML Order sample -->
    <Order ID="54996" Side="1" TxnTm="2006-10-13T16:35:37-07:00" Typ="4" Px="55.86" Acct="101">
       <Hdr Snt="2006-10-13T16:35:37-07:00" PosDup="N" PosRsnd="N" SeqNum="196" SID="BROKERA" TID="BROKERB"/>
       <!-- Buy 500 shares of "ARMOR HLDGS INC" order type stoplimit -->
       <Instrmt Sym="AH" ID="43085154" Src="1"/>
       <OrdQty Qty="500"/>
   </Order>
</FIXML>

XML in Action: FpML

• FpML: Financial Products Markup Language
• Represents contracts of financial products like interest rate derivatives
• Example of complex XML document
• vanilla interest rate swap derivative

XML in Action: Microsoft Office Open XML format

• Try unzipping a docx,pptx,xlsx file and examine the contents!

In Class Exercise

Create an XML document that indicates three cities you would like to visit. The XML document should contain a <desitination> container for each of the three cities. Each destination should have the following containers:

• <name> : name of the city
• <country> : country of the city
• <reason> : reason why you would like to visit the city
• <url> : a url with more information on the city