xml文件全部报红,怎么解决?

<?xml version="1.0" encoding="UTF-8" ?>
<!--人力资源管理系统-->
<hr xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="hr.xsd"
>
    <employee no="3309">
        <name>张三</name>
        <a3ge>33</a3ge>
        <salary>5000</salary>
        <department>
            <dname>会计部</dname>
            <address>xx大厦-B103</address>
        </department>
    </employee>
    <employee no="3310">
        <name>李四</name>
        <age>23</age>
        <salary>5000</salary>
        <department>
            <dname>工程部</dname>
            <address>xx大厦-B104</address>
        </department>
    </employee>
</hr>

上面是xml文件,下面是xsd文件

<?xml version="1.0" encoding="UTF-8" ?>
<schema xmlns="http://www.w3.org/2001/XMLSchema">
    <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-->
        <complexType>
            <!--sequence是序列,说明其中的子节点必须按照顺序前后严格书写-->
            <sequence>
                <!--声明了employee节点,最少出现1次,最多出现9999次-->
                <element name="employee" minOccurs="1" maxOccurs="9999">
                    <complexType>
                        <sequence>
                            <!--声明节点的名称和数据类型-->
                            <element name="name" type="string"></element>
                            <element name="age">
                                <!--simpleType为简单类型,可在其中对数据的值进行规范-->
                                <simpleType>
                                    <restriction base="integer">
                                        <minInclusive value="18"></minInclusive>
                                        <maxInclusive value="60"></maxInclusive>
                                    </restriction>
                                </simpleType>
                            </element>
                            <element name="salary" type="integer"></element>
                            <element name="department">
                                <complexType>
                                    <sequence>
                                        <element name="dname" type="string"></element>
                                        <element name="address" type="string"></element>
                                    </sequence>
                                </complexType>
                            </element>
                        </sequence>
                        <attribute name="no" type="string" use="required"></attribute>
                    </complexType>
                </element>
            </sequence>
        </complexType>
    </element>
</schema>