xsd:如何使用无序列表的元素扩展类型 [英] xsd: How to extend a type with an unordered list of elements

问题描述

这是我的 xml 架构的一部分

This is a part of my xml schema

<xs:complexType name="Friend">
    <xs:all>
        <xs:element name="name" type="xs:string" />
        <xs:element name="phone" type="xs:string" />
        <xs:element name="address" type="xs:string" />
    </xs:all>
</xs:complexType>

<xs:complexType name="Coworker">
    <xs:all>
        <xs:element name="name" type="xs:string" />
        <xs:element name="phone" type="xs:string" />
        <xs:element name="office" type="xs:string" />
    </xs:all>
</xs:complexType>

为了更好的可维护性，我希望在(抽象)超类型或类似的东西中有共享属性.但更重要的是，我希望所有元素都是无序且可选的.

For better maintainability, I would like to have the shared attributes in an (abstract) super type or something like that. But more important, I want that all elements are unordered and also optional.

这可能吗，最好的方法是什么?

Is this possible, and what is the best way to do it?

推荐答案

发布此问题和已接受的答案一年半后，XSD 1.1 发布.在此版本中，可以指定 OP 要求的内容，因为取消了对 xs:all 的许多限制.其中之一是现在可以扩展 xs:all.

One-and-half year after this question and the accepted answer were posted, XSD 1.1 was published. In this version it is possible to specify what the OP asked for because a number of restriction on xs:all were lifted. One of them is that it is now possible to extend an xs:all.

使用 XSD 1.1，您可以指定以下内容:

Using XSD 1.1 you can specify the following:

<xs:complexType name="Person" abstract="true">
    <xs:all>
        <xs:element name="name" type="xs:string" minOccurs="0" />
        <xs:element name="phone" type="xs:string" minOccurs="0" />
    </xs:all>
</xs:complexType>
<xs:complexType name="Friend">
    <xs:complexContent>
        <xs:extension base="Person">
            <xs:all>
                <xs:element name="address" type="xs:string" minOccurs="0" />
            </xs:all>
        </xs:extension>
    </xs:complexContent>
</xs:complexType>
<xs:complexType name="Coworker">
    <xs:complexContent>
        <xs:extension base="Person">
            <xs:all>
                <xs:element name="office" type="xs:string" minOccurs="0" />
            </xs:all>
        </xs:extension>
    </xs:complexContent>
</xs:complexType>

这定义了以下类型:

• Person:具有可选的无序name 和phone 元素的抽象类型；
• Friend:扩展Person，在无序元素列表中添加一个可选的address元素；
• Coworker:扩展 Coworker，将可选的 office 元素添加到无序元素列表中.

• Person: an abstract type with optional unordered name and phone elements;
• Friend: extends Person adding an optional address element to the list of unordered elements;
• Coworker: extends Coworker adding an optional office element to the list of unordered elements.

请注意，此解决方案并不适用于每个 XML 处理器:尽管自 XSD 1.1 发布以来已经过去了 8 年，但许多处理器仍然只支持 XSD 1.0.

Note that this solution does not work for every XML processor: even though 8 years have passed since the publication of XSD 1.1, a lot of processors still only support XSD 1.0.

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