XSD定义 - 属性或元素

时间:2013-10-28 12:40:50

标签: xml xsd xsd-1.1

如何定义xsd:complexType以便它将验证以下两种结构?

<Element Key="test" Value="test" />

<Element Key="test">
    <Value>test</Value>
</Element>

(并且不会验证这一个:)

<Element Key="test" Value="test">
    <Value>another test</Value>
</Element>

1 个答案:

答案 0 :(得分:3)

除非你使用Schematron之类的东西(在XSD 1.0之上),否则这在XSD 1.0中是不可能的。

这些是使用XSD 1.1的选项:断言和类型替代。您在下面看到的内容是根据Xerces对XSD 1.1规范的实现进行测试的。

(编辑包括Michael Kay的变体。在现实生活中,只选择一个。)

<?xml version="1.0" encoding="utf-8" ?>
<!-- XML Schema generated by QTAssistant/XSD Module (http://www.paschidev.com) -->
<xsd:schema elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xerces="http://xerces.apache.org">
    <xsd:element name="Element">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="Value" type="xsd:string" minOccurs="0"/>
            </xsd:sequence>
            <xsd:attribute name="Key" type="xsd:string" use="required"/>
            <xsd:attribute name="Value" type="xsd:string"/>
            <xsd:assert test="(Value and not(@Value)) or (@Value and not(Value))" xerces:message="Choose your Value wisely, one only."/>
            <xsd:assert test="exists(Value) != exists(@Value)" xerces:message="One way..."/>            
            <xsd:assert test="count((Value,@Value))=1" xerces:message="Another way..."/>
        </xsd:complexType>
    </xsd:element>

    <xsd:element name="Element1">
        <xsd:alternative test="@Value" type="att"/>
        <xsd:alternative test="not(@Value)" type="elt"/>
    </xsd:element>
    <xsd:complexType name="elt">
        <xsd:sequence>
            <xsd:element name="Value" type="xsd:string"/>
        </xsd:sequence>
        <xsd:attribute name="Key" type="xsd:string" use="required"/>
    </xsd:complexType>
    <xsd:complexType name="att">
        <xsd:attribute name="Key" type="xsd:string" use="required"/>
        <xsd:attribute name="Value" type="xsd:string" use="required"/>
    </xsd:complexType>

</xsd:schema>