两个xsd必须在同一命名空间下targetNamespace。

student.xsd

<?xml version="1.0" encoding="UTF-8"?>

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"

targetNamespace="http://www.example.org/classroom"

xmlns:tns="http://www.example.org/classroom"

elementFormDefault="qualified">

<xsd:element name="student" type="tns:studentType"/>

<xsd:complexType name="studentType">

<xsd:sequence>

<xsd:element name="name" type="xsd:string"/>

<xsd:element name="sex" type="tns:sexType"/>

</xsd:sequence>

</xsd:complexType>

<xsd:simpleType name="sexType">

<xsd:restriction base="xsd:string">

<xsd:enumeration value="男"/>

<xsd:enumeration value="女"/>

</xsd:restriction>

</xsd:simpleType>

</xsd:schema>

classroom.xsd

<?xml version="1.0" encoding="UTF-8"?>

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"

targetNamespace="http://www.example.org/classroom"

xmlns:tns="http://www.example.org/classroom"

elementFormDefault="qualified">

<!-- 两个文件必须在同一个命名空间下(targetNamespace) -->

<xsd:include schemaLocation="student.xsd"/>

<xsd:element name="classroom" type="tns:classroomType"/>

<xsd:complexType name="classroomType">

<xsd:sequence>

<xsd:element name="grade" type="tns:gradeType"/>

<xsd:element name="name" type="xsd:string"/>

<xsd:sequence minOccurs="1" maxOccurs="unbounded">

<xsd:element name="student" type="tns:studentType"/>

</xsd:sequence>

</xsd:sequence>

</xsd:complexType>

<xsd:simpleType name="gradeType">

<xsd:restriction base="xsd:int">

<xsd:minInclusive value="2000"/>

<xsd:maxInclusive value="3000"/>

</xsd:restriction>

</xsd:simpleType>

</xsd:schema>