XML Tutorial/XML Schema/attributeFormDefault

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Define prefixes in the schema for both our target namespace and for the W3C XML Schema namespace

File: Data.xml
<?xml version="1.0"?>
<library xmlns="http://wbex.ru/ns/library">
  <book id="b0836217462" available="yes">
    <isbn>0836217462</isbn>
    <title>Java</title>
    <authors>
      <person id="CMS">
        <name>name 1</name>
        <born>1956-11-26</born>
        <dead>2000-02-12</dead>
      </person>
    </authors>
    <characters>
      <person id="PP">
        <name>Swing</name>
        <born>1966-08-22</born>
        <qualification>GUI</qualification>
      </person>
      <person id="Snoopy">
        <name>Database</name>
        <born>1950-10-04</born>
        <qualification>JDBC</qualification>
      </person>
    </characters>
  </book>
</library>

File: Schema.xsd
<?xml version="1.0"?>
<xs:schema targetNamespace="http://wbex.ru/ns/library"
  elementFormDefault="qualified" attributeFormDefault="unqualified"
  xmlns:lib="http://wbex.ru/ns/library"
  xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="library">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="book" type="lib:bookType" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="person">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="name" type="xs:string" />
        <xs:element name="born" type="xs:date" />
        <xs:element name="dead" type="xs:date" minOccurs="0" />
        <xs:element name="qualification" type="xs:string"
          minOccurs="0" />
      </xs:sequence>
      <xs:attribute name="id" type="xs:ID" use="required" />
    </xs:complexType>
  </xs:element>
  <xs:complexType name="bookType">
    <xs:sequence>
      <xs:element name="isbn" type="xs:NMTOKEN" />
      <xs:element name="title" type="xs:string" />
      <xs:element name="authors">
        <xs:complexType>
          <xs:sequence>
            <xs:element ref="lib:person"
              maxOccurs="unbounded" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="characters">
        <xs:complexType>
          <xs:sequence>
            <xs:element ref="lib:person"
              maxOccurs="unbounded" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
    <xs:attribute name="id" type="xs:ID" use="required" />
    <xs:attribute name="available" type="xs:string" use="required" />
  </xs:complexType>
</xs:schema>


Set attributeFormDefault to qualified

<xsd:schema
  xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru/namespaces/employee"
  xmlns="http://www.wbex.ru/namespaces/employee"
  elementFormDefault="qualified"
  attributeFormDefault="qualified">
  <xsd:element name="employee">
   <xsd:complexType>
    <xsd:sequence>
     <xsd:element name="name" type="xsd:string"/>
     <xsd:element name="email" type="xsd:string"/>
     <xsd:element name="hireDate" type="xsd:string"/>
    </xsd:sequence>
    <xsd:attribute name="dept" type="xsd:string"/>
    <xsd:attribute name="client" type="xsd:string"/>
   </xsd:complexType>
  </xsd:element>
</xsd:schema>
We have set both attributes to qualified; therefore, all elements and attributes in our instance document must be qualified:
<em:employee
  xmlns:em="http://www.wbex.ru/namespaces/employee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.wbex.ru/namespaces/employee employee.xsd"
  em:dept="programming"
  em:client="Smith and Co">
  <em:name>Joe Smith</em:name>
  <em:email>a@a.ru</em:email>
  <em:hireDate>2008-10-29</em:hireDate>
</em:employee>
If we set elementFormDefault to qualified and omit attributeFormDefault (its default value is unqualified), 
we could use the following document instance:
<em:employee
  xmlns:em="http://www.wbex.ru/namespaces/employee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.wbex.ru/namespaces/employee employee.xsd"
  dept="programming"
  client="Smith and Co">
  <em:name>Joe Smith</em:name>
  <em:email>a@a.ru</em:email>
  <em:hireDate>2008-10-29</em:hireDate>
</em:employee>


Use prefixes on the components you are defining and use the W3C XML Schema vocabulary without prefixes

File: Data.xml
<?xml version="1.0"?>
<library xmlns="http://wbex.ru/ns/library">
  <book id="b0836217462" available="yes">
    <isbn>1</isbn>
    <title>Full-Time Job</title>
    <authors>
      <person id="i1">
        <name>A</name>
        <born>1999-11-26</born>
        <dead>2000-02-12</dead>
      </person>
    </authors>
    <characters>
      <person id="i2">
        <name>B</name>
        <born>1966-08-22</born>
        <qualification>bold, brash and tomboyish</qualification>
      </person>
      <person id="i3">
        <name>Snoopy</name>
        <born>1950-10-04</born>
        <qualification>extroverted beagle</qualification>
      </person>
    </characters>
  </book>
</library>
File: Schema.xsd
<?xml version="1.0"?>
<schema targetNamespace="http://wbex.ru/ns/library"
  elementFormDefault="qualified" attributeFormDefault="unqualified"
  xmlns="http://www.w3.org/2001/XMLSchema"
  xmlns:lib="http://wbex.ru/ns/library">
  <element name="library">
    <complexType>
      <sequence>
        <element name="book" type="lib:bookType" />
      </sequence>
    </complexType>
  </element>
  <element name="person">
    <complexType>
      <sequence>
        <element name="name" type="string" />
        <element name="born" type="date" />
        <element name="dead" type="date" minOccurs="0" />
        <element name="qualification" type="string"
          minOccurs="0" />
      </sequence>
      <attribute name="id" type="ID" use="required" />
    </complexType>
  </element>
  <complexType name="bookType">
    <sequence>
      <element name="isbn" type="string" />
      <element name="title" type="string" />
      <element name="authors">
        <complexType>
          <sequence>
            <element ref="lib:person" maxOccurs="unbounded" />
          </sequence>
        </complexType>
      </element>
      <element name="characters">
        <complexType>
          <sequence>
            <element ref="lib:person" maxOccurs="unbounded" />
          </sequence>
        </complexType>
      </element>
    </sequence>
    <attribute name="id" type="ID" use="required" />
    <attribute name="available" type="string" use="required" />
  </complexType>
</schema>


Use the target namespace as the default namespace of the schema document

File: Data.xml
<?xml version="1.0"?>
<library xmlns="http://wbex.ru/ns/library">
  <book id="b0836217462" available="yes">
    <isbn>0836217462</isbn>
    <title>Java</title>
    <authors>
      <person id="CMS">
        <name>name 1</name>
        <born>1956-11-26</born>
        <dead>2000-02-12</dead>
      </person>
    </authors>
    <characters>
      <person id="PP">
        <name>Swing</name>
        <born>1966-08-22</born>
        <qualification>GUI</qualification>
      </person>
      <person id="Snoopy">
        <name>Database</name>
        <born>1950-10-04</born>
        <qualification>JDBC</qualification>
      </person>
    </characters>
  </book>
</library>

File: Schema.xsd
<?xml version="1.0"?>
<xs:schema targetNamespace="http://wbex.ru/ns/library"
  elementFormDefault="qualified" attributeFormDefault="unqualified"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns="http://wbex.ru/ns/library">
  <xs:element name="library">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="book" type="bookType" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="person">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="name" type="xs:string" />
        <xs:element name="born" type="xs:date" />
        <xs:element name="dead" type="xs:date" minOccurs="0" />
        <xs:element name="qualification" type="xs:string"
          minOccurs="0" />
      </xs:sequence>
      <xs:attribute name="id" type="xs:ID" use="required" />
    </xs:complexType>
  </xs:element>
  <xs:complexType name="bookType">
    <xs:sequence>
      <xs:element name="isbn" type="xs:NMTOKEN" />
      <xs:element name="title" type="xs:string" />
      <xs:element name="authors">
        <xs:complexType>
          <xs:sequence>
            <xs:element ref="person" maxOccurs="unbounded" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="characters">
        <xs:complexType>
          <xs:sequence>
            <xs:element ref="person" maxOccurs="unbounded" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
    <xs:attribute name="id" type="xs:ID" use="required" />
    <xs:attribute name="available" type="xs:string" use="required" />
  </xs:complexType>
</xs:schema>
Источник — «http://wbex.ru/index.php?title=XML_Tutorial/XML_Schema/attributeFormDefault&oldid=10607»