【发布时间】：2011-02-20 06:28:03
【问题描述】：
我尝试将<xs:unique> 和<xs:key>/<xs:keyref> 与元素值一起使用，但我无法让它工作。如果我用属性值来做这件事，它就像一个魅力。
Test.xml
<test:config xmlns:test="http://www.example.org/Test"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.example.org/Test Test.xsd ">
<test:location id="id1" path="/path2">
<test:roles>
<test:role>role1</test:role>
<test:role>role2</test:role>
<test:role>role2</test:role> <!-- DUPLICATE: FAIL VALIDATION -->
</test:roles>
<test:action name="action1">
<test:roles>
<test:role>role1</test:role>
<test:role>role1</test:role> <!-- DUPLICATE: FAIL VALIDATION -->
<test:role>role3</test:role> <!-- NOT DEFINED: FAIL VALIDATION -->
</test:roles>
</test:action>
</test:location>
</test:config>
我要确保 roles 只定义一次，并且 action 元素下定义的 roles 只是在上层定义的那些.
Test.xsd
<xs:element name="config">
<xs:complexType>
<xs:sequence>
<xs:element ref="test:location" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="location" type="test:LocationType">
<xs:key name="keyRole">
<xs:selector xpath="test:roles" />
<xs:field xpath="test:role" />
</xs:key>
<xs:keyref name="keyrefRole" refer="test:keyRole">
<xs:selector xpath="test:action/test:roles" />
<xs:field xpath="test:role" />
</xs:keyref>
</xs:element>
<xs:complexType name="LocationType">
<xs:sequence>
<xs:element ref="test:roles" minOccurs="0" />
<xs:element name="action" type="test:ActionType" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="id" type="xs:string" use="required"/>
<xs:attribute name="path" type="xs:string" use="required"/>
</xs:complexType>
<xs:element name="roles" type="test:RolesType">
<xs:unique name="uniqueRole">
<xs:selector xpath="." />
<xs:field xpath="test:role" />
</xs:unique>
</xs:element>
<xs:complexType name="RolesType">
<xs:sequence>
<xs:element name="role" type="xs:string" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="ActionType">
<xs:sequence>
<xs:element ref="test:roles" />
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required" />
</xs:complexType>
验证失败并显示以下消息：
Description Resource Path Location Type
cvc-identity-constraint.3: Field "./test:role" of identity constraint "keyrefRole" matches more than one value within the scope of its selector; fields must match unique values. Test.xml /filebrowser-ejb/src/test/resources line 15 XML Problem
cvc-identity-constraint.3: Field "./test:role" of identity constraint "keyrefRole" matches more than one value within the scope of its selector; fields must match unique values. Test.xml /filebrowser-ejb/src/test/resources line 16 XML Problem
cvc-identity-constraint.3: Field "./test:role" of identity constraint "keyRole" matches more than one value within the scope of its selector; fields must match unique values. Test.xml /filebrowser-ejb/src/test/resources line 9 XML Problem
cvc-identity-constraint.3: Field "./test:role" of identity constraint "keyRole" matches more than one value within the scope of its selector; fields must match unique values. Test.xml /filebrowser-ejb/src/test/resources line 10 XML Problem
cvc-identity-constraint.3: Field "./test:role" of identity constraint "uniqueRole" matches more than one value within the scope of its selector; fields must match unique values. Test.xml /filebrowser-ejb/src/test/resources line 9 XML Problem
cvc-identity-constraint.3: Field "./test:role" of identity constraint "uniqueRole" matches more than one value within the scope of its selector; fields must match unique values. Test.xml /filebrowser-ejb/src/test/resources line 10 XML Problem
cvc-identity-constraint.3: Field "./test:role" of identity constraint "uniqueRole" matches more than one value within the scope of its selector; fields must match unique values. Test.xml /filebrowser-ejb/src/test/resources line 15 XML Problem
cvc-identity-constraint.3: Field "./test:role" of identity constraint "uniqueRole" matches more than one value within the scope of its selector; fields must match unique values. Test.xml /filebrowser-ejb/src/test/resources line 16 XML Problem
cvc-identity-constraint.4.1: Duplicate unique value [role1] declared for identity constraint "uniqueRole" of element "roles". Test.xml /filebrowser-ejb/src/test/resources line 9 XML Problem
cvc-identity-constraint.4.1: Duplicate unique value [role1] declared for identity constraint "uniqueRole" of element "roles". Test.xml /filebrowser-ejb/src/test/resources line 15 XML Problem
cvc-identity-constraint.4.2.2: Duplicate key value [role1] declared for identity constraint "keyRole" of element "location". Test.xml /filebrowser-ejb/src/test/resources line 9 XML Problem
cvc-identity-constraint.4.3: Key 'keyrefRole' with value 'role3' not found for identity constraint of element 'location'. Test.xml /filebrowser-ejb/src/test/resources line 19 XML Problem
如果我注释掉应该失败的行，验证仍然会失败并显示这些消息：
Description Resource Path Location Type
cvc-identity-constraint.3: Field "./test:role" of identity constraint "keyRole" matches more than one value within the scope of its selector; fields must match unique values. Test.xml /filebrowser-ejb/src/test/resources line 10 XML Problem
cvc-identity-constraint.3: Field "./test:role" of identity constraint "uniqueRole" matches more than one value within the scope of its selector; fields must match unique values. Test.xml /filebrowser-ejb/src/test/resources line 10 XML Problem
我做错了什么？
【问题讨论】：
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注意：文本内嵌的 XML 标记（在您帖子的第一行中）需要在它们周围加上反引号，否则它们会被 SO 吃掉。我帮你修好了。