使用idea编程，按照老师说的修改了xsd内容，对应xml还是报错的

参考：https://class.imooc.com/course/qadetail/115787   根据此答案修改的代码

xml代码：

<?xml version="1.0" encoding="UTF-8" ?>
<hr xmlns="http://www.w3school.com.cn"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="hr.xsd">
<!-- 人力资源管理-->
<!--首先需要一个根结点-->
<hr>
    <employee num="3309">
        <name>张三</name>
        <age>31</age>
        <salary>4500</salary>
        <department>
            <dname>市场部</dname>
            <address>佳兴大厦301</address>
        </department>
    </employee>

    <employee num="3310">
        <name>李四</name>
        <age>25</age>
        <salary>3000</salary>
        <department>
            <dname>人事部</dname>
            <address>佳兴大厦305</address>
        </department>
    </employee>
</hr>

xsd代码：

<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           targetNamespace="http://www.w3school.com.cn"
           xmlns="http://www.w3school.com.cn"
           elementFormDefault="qualified">
    <xs:element name="hr">
        <!-- complexType标签含义是复杂节点，包含子节点时必须使用这个标签 -->
        <xs:complexType>
            <xs:sequence>
                <xs:element name="employee" minOccurs="1" maxOccurs="100">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="name" type="xs:string"></xs:element>
                                <!--sting表示只允许输入字符串，不允许有子节点-->
                            <xs:element name="age" type="xs:integer"></xs:element>
                            <xs:element name="salary" type="xs:integer"></xs:element>
                            <xs:element name="department">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element name="dname" type="xs:string"></xs:element>
                                        <xs:element name="address" type="xs:string"></xs:element>
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>
                        </xs:sequence>
                        <xs:attribute name="num" type="xs:string" use="required"></xs:attribute>
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

xml报错，请问哪里有问题呢，老师