XSD:如何派生一个简单类型以向其添加属性并限制其可接受的值 [英] XSD: How to derive a simpletype both to add a attribute to it and to restrict the acceptable value of it

问题描述

例如验证以下元素:

 <population class="AAA">100</population > 

我想要对文本节点的约束是它应该是一个介于 1 和 1000 之间的数值.

The constraint I want on the text node is that it should be a numeric value, between 1 and 1000.

我的想法看起来像这样，但行不通

my idea looks like this but it doen't work

 <xsd:element name="population">
  <xsd:complexType>
    <xsd:simpleContent>
        <xsd:restriction base="xsd:integer">
            <xsd:minInclusive value="0"/>
            <xsd:maxInclusive value="1000"/>        
        </xsd:restriction>
    </xsd:simpleContent>
    <xsd:attribute name="class" type="xsd:string" use="required"/>
</xsd:complexType>

顺便说一下，我不想再定义任何新类型.谁能帮我.谢谢

By the way, I do not want to define any more new type. Can anyone help me. thank you

推荐答案

使用属性扩展简单类型

灵感来自 Petru Gardea 对XSD 自定义类型与属性的回答和限制，我想出了一个适合你的解决方案.您的元素必须是一个 complexType，它扩展了受限制的 simpleType 并带有一个属性:

Extending a simple type with attributes

Inspired by Petru Gardea's answer to XSD custom type with attribute and restriction, I have come up with a solution that should work for you. Your element must be a complexType extending the restricted simpleType with an attribute:

<!-- simple type that we want to extend with an attribute -->
<xs:simpleType name="populationType">
    <xs:restriction base="xs:integer">
        <xs:minInclusive value="0"/>
        <xs:maxInclusive value="1000"/>
    </xs:restriction>
</xs:simpleType>

<!-- extending a simple content element with an attribute -->
<xs:element name="population">
    <xs:complexType>
        <xs:simpleContent>
            <!-- populationType is a simple type -->
            <xs:extension base="populationType">
                <xs:attribute name="class" type="xs:string" use="required"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
</xs:element>

使用相同的属性集扩展多个类型

此外，如果您想扩展具有相同属性集的多个类型，您可以使用 xsd:attributeGroup 如 C. M. Sperberg-McQueen 对 XSD 的回答:向强类型简单"元素添加属性:

<!-- several types declare this set of attributes -->
<xs:attributeGroup name="extensible"> 
    <xs:attribute name="att1" type="xs:string" />
    <xs:attribute name="att2" type="xs:string" />
</xs:attributeGroup>

<!-- simple type that we want to extend with attributes -->
<xs:simpleType name="populationType">
    <xs:restriction base="xs:integer">
        <xs:minInclusive value="0"/>
        <xs:maxInclusive value="1000"/>
    </xs:restriction>
</xs:simpleType>

<!-- extending a simple content element with two 'inherited' attributes -->
<xs:element name="population">
    <xs:complexType>
        <xs:simpleContent>
            <!-- populationType is a simple type -->
            <xs:extension base="populationType">
                <xs:attributeGroup ref="extensible"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
</xs:element>

这将验证以下 xml 元素:

This would validate the following xml element:

<population att1="AAA" att2="BBB">100</population >

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