This text file contains sample code fragments from:
Section 12.1 - Message Flexibility and Constraint Granularity
Chapter 12 - Advanced XML Schema Part I: Message Flexibility, Type Inheritance, and Composition
Book - Web Service Contract Design & Versioning for SOA
Series - Prentice Hall Service-Oriented Computing Series from Thomas Erl
Site - www.soabooks.com


<xsd:complexType name="LineItemType">
  <xsd:sequence>
    <xsd:element name="productID" type="ProductIDType"/>
    <xsd:element name="productName" type="xsd:string"/>
    <xsd:any minOccurs="0" maxOccurs="unbounded"
      processContents="lax"
      namespace="http://actioncon.com/schema/gameinfo"/>
  </xsd:sequence>
</xsd:complexType>

Example 12.1 - The xsd:any element establishing a wildcard as part of the LineItemType complex type.


<lineItem xmlns:game="http://actioncon.com/gameinfo">
  <productID>AY2345</productID>
  <productName>Service Blaster 2000</productName>
  <game:comment>This is a reorder.</game:comment>
  <game:consoleVersion>1.0</game:consoleVersion>
</lineItem>

Example 12.2 - An instance of the LineItemType complex type containing two replacement elements (highlighted).


<xsd:complexType name="LineItemType">
  <xsd:sequence>
    <xsd:element name="productID" type="ProductIDType"/>
    <xsd:element name="productName" type="xsd:string"/>
    <xsd:any minOccurs="0" maxOccurs="unbounded"
      processContents="lax"
      namespace="http://actioncon.com/gameinfo"/>
  </xsd:sequence>
  <xsd:anyAttribute namespace="##other"/>
</xsd:complexType>

Example 12.3 - The xsd:anyAttribute element establishing an attribute wildcard as part of the LineItemType complex type.


<lineItem xmlns:game="http://actioncom.com/gameinfo"
  game:gameCategory="ACT">
  <productID>AY2345</productID>
  <productName>Service Blaster 2000</productName>
  <game:comment>This is a reorder.</game:comment>
  <game:consoleVersion>1.0</game:consoleVersion>
</lineItem>

Example 12.4 - An instance of the LineItemType complex type containing both replacement elements and a replacement attribute (highlighted).


<xsd:complexType name="LineItemType">
  <xsd:sequence>
    <xsd:element name="productID" type="ProductIDType"/>
    <xsd:element name="productName" type="xsd:string"/>
    <xsd:element name="extension" type="ExtensionType"
      minOccurs="0"/>
  </xsd:sequence>
</xsd:complexType>
<xsd:complexType name="ExtensionType">
  <xsd:sequence>
    <xsd:any minOccurs="0" maxOccurs="unbounded"
      processContents="lax" namespace="##other"/>
  </xsd:sequence>
</xsd:complexType>

Example 12.5 - The extension global element with a complex type that acts as an "extension bucket."


<lineItem xmlns:game="http://actioncon.com/gameinfo">
  <productID>AY2345</productID>
  <productName>Service Blaster 2000</productName>
  <extension>
    <game:comment>This is a reorder.</game:comment>
    <game:consoleVersion>1.0</game:consoleVersion>
  </extension>
</lineItem>

Example 12.6 - An instance of the lineItem element within the extension construct acting as the "bucket."


<xsd:complexType name="LineItemType">
  <xsd:sequence>
    <xsd:element name="productID" type="ProductIDType"/>
    <xsd:element name="productName" type="xsd:string"/>
    <xsd:element name="extension"
      minOccurs="0" type="xsd:anyType"/>
  </xsd:sequence>
</xsd:complexType>

Example 12.7 - The updated schema using the xsd:anyType type.


<game>
  ...
  <hdtv>true</hdtv>
  <surround_sound>true</surround_sound>
  <minPlayers>1</minPlayers>
  <maxPlayers>3</maxPlayers>
  <esrbRating>EC</esrbRating>
</game>

Example 12.8 - The game construct with a set of different child elements, each of which represents a specific feature of the game.


<game>
  ...
  <feature name="hdtv">true</feature>
  <feature name="surround_sound">true</feature>
  <feature name="minPlayers">1</feature>
  <feature name="maxPlayers">3</feature>
  <feature name="esrbRating">EC</feature>
</game>

Example 12.9 - The game construct with a set of the same feature child elements, each of which identifies a feature of the game via its name attribute.


<xsd:complexType name="GameType">
  <xsd:sequence>
    <xsd:element name="productID" type="ProductIDType"/>
    <xsd:element name="gtin" type="GTINType"/>
    <xsd:element name="title" type="TitleType"/>
    <xsd:element name="desc" type="DescType"/>
    <xsd:element name="msrPrice" type="PriceType"/>
    <xsd:element name="version" type="GameVersionType"/>(
    <xsd:element name="onlinePreview" type="xsd:boolean"/>
    <xsd:element name="feature" maxOccurs="unbounded"
      type="FeatureType"/>
  </xsd:sequence>
</xsd:complexType>
<xsd:complexType name="FeatureType">
  <xsd:simpleContent>
    <xsd:extension base="xsd:string">
      <xsd:attribute name="name" type="xsd:string"/>
    </xsd:extension>
  </xsd:simpleContent>
</xsd:complexType>

Example 12.10 - The GameType complex type with child elements that provide generic feature capabilities.


<xsd:complexType name="AddressType">
  <xsd:sequence>
    <xsd:element name="line1" type="xsd:string"/>
    <xsd:element name="line2" type="xsd:string" minOccurs="0"/>
    <xsd:element name="city" type="xsd:string"/>
    <xsd:choice>
      <xsd:element name="state" type="xsd:string"/>
      <xsd:element name="province" type="xsd:string"/>
    </xsd:choice>
    <xsd:element name="postalCode" type="xsd:string"/>
    <xsd:element name="country" type="xsd:string"/>
  </xsd:sequence>
</xsd:complexType>

Example 12.11 - A nested xsd:choice group that allows either a state or a province element to appear within the AddressType construct.


<xsd:complexType name="LineItemsType">
  <xsd:choice maxOccurs="unbounded">
    <xsd:element name="comment" type="xsd:string"/>
    <xsd:element name="lineItem" type="LineItemType"/>
  </xsd:choice>
</xsd:complexType>

Example 12.12 - A complexType construct with a repeating xsd:choice group.


<xsd:complexType name="LineItemsType">
  <xsd:all>
    <xsd:element name="comment" type="xsd:string"/>
    <xsd:element name="lineItem" type="LineItemType"/>
  </xsd:all>
</xsd:complexType>

Example 12.13 - The xsd:all construct representing the comment and lineItems elements. Because neither child element has a minOccurs attribute, the default behavior of this group will require that both be displayed.


<xsd:complexType name="GameType">
  <xsd:sequence>
    <xsd:element name="gtin" type="GTINType"/>
    <xsd:element name="title" type="xsd:string"/>
    <xsd:element name="desc" type="DescType" maxOccurs="3"/>
  </xsd:sequence>
</xsd:complexType>

Example 12.14 - A standard xsd:sequence group that establishes a specific order.