xsd中的attributeGroup及其xml表示

鉴于此XSD来自

.. 等

那么为什么eclipse会给我这个错误呢

cvc复杂类型.2.4.a:发现以元素“jdbc用户服务”开头的无效内容。“{”http:// 应为www.springframework.org/schema/security“：user}”

当我提供以下XML时

<jdbc-user-service
    data-source-ref="dataSource"
    users-by-username-query="SELECT u.uname, u.upwd, u.enabled FROM ucsdb.users u WHERE u.uname = ?"/>

---

我觉得你把事情搞混了。您可能是从另一个XML中得到这个错误。根据XSD，您发布的XML（假设名称空间是正确的，请参见下文以防万一）是有效的

<jdbc-user-service xmlns="http://www.springframework.org/schema/security" data-source-ref="dataSource" users-by-username-query="SELECT u.uname, u.upwd, u.enabled FROM ucsdb.users u WHERE u.uname = ?"/>

发布的XSD中唯一的“user”元素来自此元素：

<xs:element name="user-service" substitutionGroup="security:any-user-service">
    <xs:annotation>
        <xs:documentation>Creates an in-memory UserDetailsService from a properties file or a list of "user" child elements. Usernames are converted to lower-case internally to allow for case-insensitive lookups, so this should not be used if case-sensitivity is required.</xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:sequence>
            <xs:element minOccurs="0" maxOccurs="unbounded" name="user">
                <xs:annotation>
                    <xs:documentation>Represents a user in the application.</xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:attributeGroup ref="security:user.attlist"/>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
        <xs:attribute name="id" type="xs:token">
            <xs:annotation>
                <xs:documentation>A bean identifier, used for referring to the bean elsewhere in the context.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attributeGroup ref="security:properties-file"/>
    </xs:complexType>
</xs:element>

从属性文件或“用户”子元素列表创建内存中的UserDetailsService。用户名在内部转换为小写，以允许不区分大小写的查找，因此如果需要区分大小写，则不应使用此选项。
表示应用程序中的用户。
bean标识符，用于在上下文中的其他位置引用bean。

因此，您必须验证使用“用户服务”标记的XML

<xs:element name="user-service" substitutionGroup="security:any-user-service">
    <xs:annotation>
        <xs:documentation>Creates an in-memory UserDetailsService from a properties file or a list of "user" child elements. Usernames are converted to lower-case internally to allow for case-insensitive lookups, so this should not be used if case-sensitivity is required.</xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:sequence>
            <xs:element minOccurs="0" maxOccurs="unbounded" name="user">
                <xs:annotation>
                    <xs:documentation>Represents a user in the application.</xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:attributeGroup ref="security:user.attlist"/>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
        <xs:attribute name="id" type="xs:token">
            <xs:annotation>
                <xs:documentation>A bean identifier, used for referring to the bean elsewhere in the context.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attributeGroup ref="security:properties-file"/>
    </xs:complexType>
</xs:element>