This text file contains sample code fragments from:
Section 13.2 - Representing Relationships in XML Schemas
Chapter 13 - Advanced XML Schema Part II: Reusability, Relational Design, and Industry Schemas
Book - Web Service Contract Design & Versioning for SOA
Series - Prentice Hall Service-Oriented Computing Series from Thomas Erl
Site - www.soabooks.com


<games>
  <game>
    <productID>AY2344</productID>
    <gtin>1234567890123</gtin>
    <title>Service Blaster 2000</title>
    ...
    <consoles>
      <console>
        <productID>CC1567</productID>
        <gtin>1234567890456</gtin>
        <title>ActionCon X3T</title>
      </console>
      <console>
        <productID>CC1568</productID>
        <gtin>1234567890498</gtin>
        <title>ActionCon X3T Turbo</title>
      </console>
    </consoles>
  </game>
  <game>
    <productID>BB1764</productID>
    <gtin>1234567890124</gtin>
    <title>Interactive Service Magic</title>
    ...
    <consoles>
      <console>
        <productID>CC1567</productID>
        <gtin>1234567890456</gtin>
        <title>ActionCon X3T</title>
      </console>
      <console>
        <productID>CC1573</productID>
        <gtin>1234567890455</gtin>
        <title>ActionCon X3B</title>
      </console>
    </consoles>
  </game>
</games>

Example 13.9 - A message instance that uses repeating constructs to represent many-to-many relationships.


<gameinfo>
  <games>
    <game>
      <productID>AY2344</productID>
      <gtin>123456780123</gtin>
      <title>Service Blaster 2000</title>
      ...
      <consoleRefs>
        <consoleRef productID="CC1567"/>
        <consoleRef productID="CC1568"/>
      </consoleRefs>
    </game>
    <game>
      <productID>BB1764</productID>
      <gtin>1234567890124</gtin>
      <title>Interactive Service Magic</title>
      ...
      <consoleRefs>
        <consoleRef productID="CC1567"/>
        <consoleRef productID="CC1573"/>
      </consoleRefs>
    </game>
  </games>
  <consoles>
    <console>
      <productID>CC1567</productID>
      <gtin>1234567890456</gtin>
      <title>ActionCon X3T</title>
    </console>
    <console>
      <productID>CC1568</productID>
      <gtin>1234567890498</gtin>
      <title>ActionCon X3T Turbo</title>
    </console>
    <console>
      <productID>CC1573</productID>
      <gtin>1234567890455</gtin>
      <title>ActionCon X3B</title>
    </console>
  </consoles>
</gameinfo>

Example 13.10 - This message instance uses identifiers to emulate a many-to-many relationship between games and consoles.


<xsd:element name="gameinfo" type="GameInfoType">
  <xsd:key name="consoleIDKey">
    <xsd:selector xpath="consoles/console"/>
    <xsd:field xpath="productID"/>
  </xsd:key>
  <xsd:keyref name="consoleIDRef" refer="consoleIDKey">
    <xsd:selector xpath="games/game/consoleRefs/consoleRef"/>
    <xsd:field xpath="@productID"/>
  </xsd:keyref>
</xsd:element>

Example 13.11 - An element with identity constraints established via the xsd:key and xsd:keyref elements.


<gameinfo>
  <games>
  <game>
    <productID>AY2344</productID>
    <gtin>1234567890123</gtin>
    <title>Service Blaster 2000</title>
    ...
  </game>
  <game>
    <productID>BB1764</productID>
    <gtin>1234567890124</gtin>
    <title>Interactive Service Magic</title>
    ...
  </game>
  </games>
  <consoles>
    <console>
      <productID>CC1567</productID>
      <gtin>1234567890456</gtin>
      <title>ActionCon X3T</title>
    </console>
    <console>
      <productID>CC1568</productID>yref
      <gtin>1234567890498</gtin>
      <title>ActionCon X3T Turbo</title>
    </console>
    <console>
      <productID>CC1573</productID>
      <gtin>1234567890455</gtin>
      <title>ActionCon X3B</title>
    </console>
  </consoles>
  <game-consoles>
    <game-console>
      <gameRef productID="AY2344"/>
      <consoleRef productID="CC1567"/>
      <comment>requires memory upgrade</comment>
    </game-console>
    <game-console>
      <gameRef productID="AY2344"/>
      <consoleRef productID="CC1568"/>
    </game-console>
    <game-console>
      <gameRef productID="BB1764"/>
      <consoleRef productID="CC1567"/>
    </game-console>
    <game-console>
      <gameRef productID="BB1764"/>
      <consoleRef productID="CC1573"/>
    </game-console>
  </game-consoles>
</gameinfo>

Example 13.12 - An instance of a message wherein reference ID values are used to associate game and console elements with game-console elements.