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我想验证以下 xml：

<?xml version="1.0" encoding="UTF-8"?>

<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <root1>
        <items>
            <item id="1">
                <interfaces>
                    <interface id="0"/>
                    <interface id="1"/>
                    <interface id="2"/>
                </interfaces>
            </item>
            <item id="2">
                <interfaces>
                    <interface id="10"/>
                    <interface id="11"/>
                    <interface id="2"/>
                </interfaces>
            </item>
        </items>
        <connections>
            <connection id="1">
                <point item="1" interface="0"/>
                <point item="2" interface="10"/>
            </connection>
            <connection id="2">
                <point item="1" interface="1"/>
                <point item="2" interface="11"/>
            </connection>
            <connection id="3">
                <point item="1" interface="2"/>
                <point item="2" interface="157"/>      <-- this one is not valid as there is no interface 157 under item 2.
            </connection>
        </connections>
    </root1>
</root>

这是验证项目的代码：

<?xml version="1.0" encoding="ISO-8859-1"?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

    <xs:element name="root">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="root1" type="root1" minOccurs="1" maxOccurs="1"/>
            </xs:sequence>
        </xs:complexType>
        <xs:keyref name="endPointIntfKeyRef" refer="interfaceKey">
            <xs:selector xpath="root1/connections/connection/point"/>
            <xs:field xpath="@interface"/>
        </xs:keyref>
    </xs:element>

    <xs:complexType name="root1">
        <xs:sequence>
            <xs:element name="items" minOccurs="1" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="item" type="item" minOccurs="1" maxOccurs="unbounded"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:element name="connections" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="connection" type="connection" minOccurs="1" maxOccurs="unbounded"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="item">
        <xs:sequence>
            <xs:element name="interfaces" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="interface" type="interface" minOccurs="1" maxOccurs="unbounded"/>
                    </xs:sequence>
                </xs:complexType>
                    <xs:unique name="interfaceKey">
                        <xs:selector xpath="interface"/>
                        <xs:field xpath="@id"/>
                    </xs:unique>
            </xs:element>
        </xs:sequence>
        <xs:attribute name="id" type="xs:int" use="required"/>
    </xs:complexType>

    <xs:complexType name="interface">
        <xs:attribute name="id" type="xs:int" use="required"/>
    </xs:complexType>

    <xs:complexType name="connection">
        <xs:sequence>
            <xs:element name="point" minOccurs="2" maxOccurs="2">
                <xs:complexType>
                    <xs:attribute name="item" type="xs:int" use="required"/>
                    <xs:attribute name="interface" type="xs:int" use="required"/>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
        <xs:attribute name="id" type="xs:int" use="required"/>
    </xs:complexType>

</xs:schema>

但它会产生我不想拥有的“为键序列找到多个匹配项”，因为接口在特定项目下是唯一的。

$ xmllint --noout --schema 1.xsd 1.xml 
1.xml:31: Schemas validity error : Element 'point': More than one match found for key-sequence ['2'] of keyref 'endPointIntfKeyRef'.
1.xml:32: Schemas validity error : Element 'point': No match found for key-sequence ['157'] of keyref 'endPointIntfKeyRef'.
1.xml fails to validate

如何仅获得第二个错误'元素'点'：没有为keyref'endPointIntfKeyRef'的键序列['157']找到匹配项，而不是第一个？

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1 回答 1

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错误消息是正确的 - keyref 值中有两个可能的匹配项。要获得您需要的行为，您需要一个复合键值，包括ID 以及您可以同时使用和属性的 ID ，但这意味着将约束定义为interfaceKey2iteminterfacekeyrefiteminterfacepointunique

<xs:unique name="interfaceKey">
    <xs:selector xpath="interface"/>
    <xs:field xpath="../@id"/><!-- not allowed in 1.0 -->
    <xs:field xpath="@id"/>
</xs:unique>

并且 XML Schema 1.0 不允许..在字段或选择器（受限制的）XPath 表达式中使用。

于 2014-02-15T20:54:48.587 回答