简述: 错误在 xml 里面, 而非在 schema 里面.
1. 从 Schema/WSDL 结构图中可以看到, onerecording 后面跟了一个"队列", 里面的元素是不可缺少的, 所以, 您要为您第一个出错的地方加上 <comment />, 下文已标明.
2. 从 Schema/WSDL Facets Enumeration 中可以看到, media 是一个"枚举", 里面的元素是不可逾越的, 所以, 您要在您第二个出错的地方把多出来的空格去掉, 下文已标明.

我是新手, 但我想说您几句:
错误很基本, 看图很明了! 拿着 xmlspy 却没好好研究, altova 很遗憾!

<?xml version="1.0" encoding="UTF-8"?>
<recordings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="recording.xsd">
    <recording media="CD" quality="8">
        <title>Pandit Ravi Shankar</title>
        <performers>
            <performer>Ravi Shankar</performer>
            <performer>jin</performer>
        </performers>
        <comments>老弟,忘了我不是?不加 comments 是不行Di~~~</comments>
    </recording>
    <!--还有后面这行的 LP 要短一点啦~你原来有空格-->
    <recording media="LP" quality="6">
        <title>The title Bach Book</title>
        <performers>
            <performer>SoftGuard</performer>
        </performers>
        <comments>
        There in s scratch at the beginning os side 2.
    </comments>
    </recording>
    <recording media="tape" quality="5">
        <title>Bach English</title>
        <performers>
            <performer>Jingang</performer>
        </performers>
        <comments>An  exceptionally good performance</comments>
    </recording>
</recordings>

成品预览!

以下内容为程序代码: <?xml version="1.0" encoding="UTF-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">     <xs:element name="recordings" type="recordinglist"/>     <xs:simpleType name="attrmedia">         <xs:restriction base="xs:string">             <xs:enumeration value="CD"/>             <!--下一行的 LP 被我添加了一个空格, 就能适应您的 xml 啦!-->             <xs:enumeration value="LP "/>             <xs:enumeration value="tape"/>             <!--这里定义的是media属性的类型-->         </xs:restriction>     </xs:simpleType>     <xs:simpleType name="attrquality">         <xs:restriction base="xs:integer">             <xs:minInclusive value="0"/>             <xs:maxInclusive value="10"/>         </xs:restriction>         <!--这里定义的是quality属性的类型-->     </xs:simpleType>     <xs:complexType name="performerlist">         <xs:sequence>             <xs:element name="performer" type="xs:string" maxOccurs="unbounded"/>         </xs:sequence>         <!--这里定义的是performer元素的复杂类型-->     </xs:complexType>     <xs:complexType name="onerecording">         <xs:sequence>             <xs:element name="title" type="xs:string"/>             <xs:element name="performers" type="performerlist"/>             <!--下一行的 comments 被我改啦! 添个 minOccurs="0" 就好啦!-->             <xs:element name="comments" type="xs:string" minOccurs="0"/>         </xs:sequence>         <xs:attribute name="media" type="attrmedia" use="required"/>         <xs:attribute name="quality" type="attrquality" use="required"/>         <!--这里定义的是cording元素的复杂类型-->     </xs:complexType>     <xs:complexType name="recordinglist">         <xs:sequence>             <xs:element name="recording" type="onerecording" minOccurs="0" maxOccurs="unbounded"/>         </xs:sequence>         <!-- 这里定义XML文件的root元素-->     </xs:complexType> </xs:schema>