Use the target namespace as the default namespace of the schema document : attributeFormDefault « XML Schema « XML Tutorial

1. XML Tutorial
2. XML Schema
3. attributeFormDefault

File: Data.xml

<?xml version="1.0"?>
<library xmlns="http://java2s.com/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://java2s.com/ns/library"
  elementFormDefault="qualified" attributeFormDefault="unqualified"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns="http://java2s.com/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>