xhd

student.xhd
<?xml version=”1.0″?>
<xsd:schema xmlns=”http://www.itcast.cn/xml”

    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://www.itcast.cn/xml" elementFormDefault="qualified">
<xsd:element name="students" type="studentsType"/>
<xsd:complexType name="studentsType">
    <xsd:sequence>
        <xsd:element name="student" type="studentType" minOccurs="0" maxOccurs="unbounded"/>
    </xsd:sequence>
</xsd:complexType>
<xsd:complexType name="studentType">
    <xsd:sequence>
        <xsd:element name="name" type="xsd:string"/>
        <xsd:element name="age" type="ageType" />
        <xsd:element name="sex" type="sexType" />
    </xsd:sequence>
    <xsd:attribute name="number" type="numberType" use="required"/>
</xsd:complexType>
<xsd:simpleType name="sexType">
    <xsd:restriction base="xsd:string">
        <xsd:enumeration value="male"/>
        <xsd:enumeration value="female"/>
    </xsd:restriction>
</xsd:simpleType>
<xsd:simpleType name="ageType">
    <xsd:restriction base="xsd:integer">
        <xsd:minInclusive value="0"/>
        <xsd:maxInclusive value="256"/>
    </xsd:restriction>
</xsd:simpleType>
<xsd:simpleType name="numberType">
    <xsd:restriction base="xsd:string">
        <xsd:pattern value="heima_\d{4}"/>
    </xsd:restriction>
</xsd:simpleType>

</xsd:schema>
student.xml
<?xml version=”1.0″ encoding=”UTF-8″ ?>
<!–

1. 填写 xml 文档的根元素
2. 引入 xsi 前缀.  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3. 引入 xsd 文件命名空间.  xsi:schemaLocation="http://www.itcast.cn/xml  student.xsd"
4. 为每一个 xsd 约束声明一个前缀, 作为标识  xmlns="http://www.itcast.cn/xml" 

–>
<students xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”

        xmlns="http://www.itcast.cn/xml"
        xsi:schemaLocation="http://www.itcast.cn/xml  student.xsd"

<student number="heima_0001">
    <name>tom</name>
    <age>18</age>
    <sex>male</sex>
</student>

</students>