Chapter 13: Deriving complex types¶

Schema

<!--Definitive XML Schema by Priscilla Walmsley (c) 2012 Prentice Hall PTR -->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <xsd:annotation>
    <xsd:documentation>
      This example illustrates complex types that are derived from other specified types.
    </xsd:documentation>
  </xsd:annotation>

  <xsd:element name="items" type="ItemsType"/>

  <xsd:complexType name="ItemsType">
    <xsd:choice minOccurs="0" maxOccurs="unbounded">
      <xsd:element name="hat" type="ProductType"/>
      <xsd:element name="umbrella" type="RestrictedProductType"/>
      <xsd:element name="shirt" type="ShirtType"/>
    </xsd:choice>
  </xsd:complexType>

  <!--Empty Content Type-->
  <xsd:complexType name="ItemType" abstract="true">
    <xsd:attribute name="routingNum" type="xsd:integer"/>
  </xsd:complexType>

  <!--Empty Content Extension (with Attribute Extension)-->
  <xsd:complexType name="ProductType">
    <xsd:complexContent>
      <xsd:extension base="ItemType">
        <xsd:sequence>
          <xsd:element name="number" type="xsd:integer"/>
          <xsd:element name="name" type="xsd:string"/>
          <xsd:element name="description" type="xsd:string" minOccurs="0"/>
        </xsd:sequence>
        <xsd:attribute name="effDate" type="xsd:date"/>
        <xsd:attribute name="lang" type="xsd:language"/>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

  <!--Complex Content Restriction-->
  <xsd:complexType name="RestrictedProductType">
    <xsd:complexContent>
      <xsd:restriction base="ProductType">
        <xsd:sequence>
          <xsd:element name="number" type="xsd:integer"/>
          <xsd:element name="name" type="xsd:token"/>
        </xsd:sequence>
        <xsd:attribute name="routingNum" type="xsd:short" use="required"/>
        <xsd:attribute name="effDate" type="xsd:date" default="1900-01-01"/>
        <xsd:attribute name="lang" use="prohibited"/>
      </xsd:restriction>
    </xsd:complexContent>
  </xsd:complexType>

  <!--Complex Content Extension-->
  <xsd:complexType name="ShirtType">
    <xsd:complexContent>
      <xsd:extension base="RestrictedProductType">
        <xsd:choice maxOccurs="unbounded">
          <xsd:element name="size" type="SmallSizeType"/>
          <xsd:element name="color" type="ColorType"/>
        </xsd:choice>
        <xsd:attribute name="sleeve" type="xsd:integer"/>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

  <!--Simple Content Extension-->
  <xsd:complexType name="SizeType">
    <xsd:simpleContent>
      <xsd:extension base="xsd:integer">
        <xsd:attribute name="system" type="xsd:token"/>
      </xsd:extension>
    </xsd:simpleContent>
  </xsd:complexType>

  <!--Simple Content Restriction-->
  <xsd:complexType name="SmallSizeType">
    <xsd:simpleContent>
      <xsd:restriction base="SizeType">
        <xsd:minInclusive value="2"/>
        <xsd:maxInclusive value="6"/>
        <xsd:attribute  name="system" type="xsd:token"
                        use="required"/>
      </xsd:restriction>
    </xsd:simpleContent>
  </xsd:complexType>

  <xsd:complexType name="ColorType">
    <xsd:attribute name="value" type="xsd:string"/>
  </xsd:complexType>

</xsd:schema>

XML Document

<items xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="chapter14.xsd">
  <hat routingNum="123456" effDate="2002-04-02" lang="en-US">
    <number>557</number>
    <name>Ten-Gallon Hat</name>
    <description>This is a great hat!</description>
  </hat>
  <umbrella routingNum="123" effDate="2002-04-02">
    <number>557</number>
    <name>Ten-Gallon Hat</name>
  </umbrella>
  <shirt routingNum="124" effDate="2002-04-02" sleeve="17">
    <number>557</number>
    <name>Short-Sleeved Linen Blouse</name>
    <color value="blue"/>
    <size system="US-DRESS">6</size>
  </shirt>
</items>

xsData XML Document

<?xml version='1.0' encoding='UTF-8'?>
<items>
  <hat routingNum="123456" effDate="2002-04-02" lang="en-US">
    <number>557</number>
    <name>Ten-Gallon Hat</name>
    <description>This is a great hat!</description>
  </hat>
  <umbrella routingNum="123" effDate="2002-04-02">
    <number>557</number>
    <name>Ten-Gallon Hat</name>
  </umbrella>
  <shirt routingNum="124" effDate="2002-04-02" sleeve="17">
    <number>557</number>
    <name>Short-Sleeved Linen Blouse</name>
    <size system="US-DRESS">6</size>
    <color value="blue"/>
  </shirt>
</items>

xsData JSON

{
    "hat": [
        {
            "routing_num": 123456,
            "number": 557,
            "name": "Ten-Gallon Hat",
            "description": "This is a great hat!",
            "eff_date": "2002-04-02",
            "lang": "en-US"
        }
    ],
    "umbrella": [
        {
            "number": 557,
            "name": "Ten-Gallon Hat",
            "routing_num": 123,
            "description": null,
            "eff_date": "2002-04-02",
            "lang": null
        }
    ],
    "shirt": [
        {
            "number": 557,
            "name": "Short-Sleeved Linen Blouse",
            "routing_num": 124,
            "description": null,
            "eff_date": "2002-04-02",
            "lang": null,
            "size": [
                {
                    "value": 6,
                    "system": "US-DRESS"
                }
            ],
            "color": [
                {
                    "value": "blue"
                }
            ],
            "sleeve": 17
        }
    ]
}

Samples Source