使用XSD验证的节点属性值唯一性 [英] Node attribute value uniqueness using XSD validation

问题描述

你好fellas，

我有以下问题。有许多类似的元素。我想确保只有一个默认属性设置为true。怎么样？这是一个例子。我希望我的验证失败以获取以下XML：

< root>
< element name =" e1" />

< element name =" E2" default =" true" />

< element name =" e3" default =" true" />

< element name =" e4" />

< / root>

请注意"默认"是一个可选属性：

< xs：element name =" element">
< xs：complexType>
< xs：attribute name =" default" type =" xs：boolean" />
< xs：attribute name =" name"使用= QUOT;需" type =" xs：NCName" />
< / xs：complexType>
< / xs：element>

解决方案

您可以使用W3C XML模式语言1.0来定义唯一性约束：

< td> < / xs：complexType >

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

< xs：element name = " root" >

< xs：complexType >

< < font style ="font-size：11px"> xs：sequence >

< xs：element maxOccurs = " unbounded" name = " element" >

< xs：complexType >

< < font style ="font-size：11px"> xs：attribute name = " name" type < font style ="font-size：11px"> = " xs：string" 使用 = " required" />

< xs：attribute name = " default" type = " xs：boolean" 使用 = " optional" />

< / xs：element > ;

< / xs：sequence > < font style ="font-size：11px">

< / xs：complexType >

< xs：unique name = " unique-default" >

< xs：selector xpath = " element" />

< xs：field xpath = " @ default" />

< / xs：unique >

< / xs：element >

< / xs：schema >

Hi fellas,

I have the following problem. There are multiple similar elements. I want to make sure that only one has the default attribute set to true. How? Here is example. I want my validation to fail for the following XML:

<root>
<element name="e1"/>
<element name="e2" default="true"/>
<element name="e3" default="true"/>
<element name="e4"/>
</root>

Note that "default" is an optional attribute:

    <xs:element name="element">
        <xs:complexType>
            <xs:attribute name="default" type="xs:boolean"/>
            <xs:attribute name="name" use="required" type="xs:NCName"/>
        </xs:complexType>
    </xs:element>

解决方案

Well what you can do with the W3C XML schema language 1.0 is define a uniqueness constraint:

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

<xs:element name="root">

<xs:complexType>

<xs:sequence>

<xs:element maxOccurs="unbounded" name="element">

<xs:complexType>

<xs:attribute name="name" type="xs:string" use="required" />

<xs:attribute name="default" type="xs:boolean" use="optional" />

</xs:complexType>

</xs:element>

</xs:sequence>

</xs:complexType>

<xs:unique name="unique-default">

<xs:selector xpath="element"/>

<xs:field xpath="@default"/>

</xs:unique>

</xs:element>

</xs:schema>

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