XML Tutorial/XML Schema/complexContent

Basing Complex Types on Complex Types

Declaring an Element of Complex Type
File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">
  <xsd:complexType name="characteristicsType">
    <xsd:sequence>
      <xsd:element name="weight" type="xsd:string" />
      <xsd:element name="length" type="xsd:string" />
    </xsd:sequence>
      <xsd:attribute name="kind" type="xsd:string" />
  </xsd:complexType>
  <xsd:complexType name="birthType">
    <xsd:complexContent>
      <xsd:extension base="characteristicsType">
        <xsd:sequence>
          <xsd:element name="mother" type="xsd:string" />
          <xsd:element name="birthdate" type="xsd:date" />
        </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>
  <xsd:element name="birth_characteristics" type="birthType" />
</xsd:schema>
 
File: Data.xml
<?xml version="1.0"?>
<birth_characteristics xmlns="http://www.wbex.ru" kind="normal">
  <weight>2-3 pounds</weight>
  <length>18-24 inches</length>
  <mother>Abcde</mother>
  <birthdate>1999-06-10</birthdate>
</birth_characteristics>

Defining Empty Elements

Elements that can contain attributes but that have no content between the opening and closing tags are considered empty.
File: Schema.xsd 
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">
  <xsd:complexType name="sourceType">
    <xsd:complexContent>
      <xsd:extension base="xsd:anyType">
        <xsd:attribute name="sectionid" type="xsd:integer" />
        <xsd:attribute name="newspaperid" type="xsd:integer" />
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>
  
  <xsd:element name="source" type="sourceType" />
</xsd:schema>
 
File: Data.xml
<?xml version="1.0"?>
<source xmlns="http://www.wbex.ru" sectionid="101" newspaperid="21"/>

Derived by Restriction

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">
  <xs:complexType name="ShortAddress">
    <xs:complexContent>
      <xs:restriction base="Address">
        <xs:sequence>
          <xs:element name="Name" type="xs:string" />
          <xs:element name="Street" type="xs:string"
            minOccurs="1" maxOccurs="2" />
          <xs:element name="City" type="xs:string" />
        </xs:sequence>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>
</xs:schema>