XSD和多态 [英] XSD and polymorphism

问题描述

我有点在第一次问错这个问题时重复了这个问题.

I am kinda repeating this question bit the 1st time it was asked incorrectly.

我有这个:

<xsd:complexType name="A">
        <xsd:sequence>
            <xsd:element name="options" type="options"/>
        </xsd:sequence>
</xsd:complexType>

<xsd:complexType name="B">  
    <xsd:complexContent>
            <xsd:element name="options" type="ex_options"/>
    </xsd:complexContent>
</xsd:complexType>

<xsd:complexType name="options">
    <xsd:sequence>
        ...some options
    </xsd:sequence>
</xsd:element>

<xsd:complexType name="ex_options">
    <xsd:complexContent>
         <xsd:extension base="options">
             <xsd:sequence>
              ...some more options
              </xsd:sequence>
          </xsd:extension>
     </xsd:complexContent>
 </xsd:element>

所以基本上我有一个A类，带有一个内部选项类 类B继承自类A，我希望B.options继承自A.options，这样，当我们进行网络服务时，我们只需要传递a；当我们调用getOptions时，它将返回正确的对象B.options.目前，以xsd表示的方式出现一个错误，说多个具有不同类型名称选项的元素出现在模型组中.错误属于B型.

So basically I have class A with an inner class of options Class B inherits from class A and I want B.options to inherit from A.options so that when we do webservices we only need to pass a and when we call getOptions it will return the right object B.options. Currently with the way the xsd stands I get an error saying multiple elements with name options with different types appear in the model group. The errors is in the B type.

推荐答案

只需坚持使用B类型的元素，然后使用，然后使用适当的xsi:type属性值按如下所述装饰实例文档元素.

Just stick with elements of type B and then use then decorate your instance document elements as described below with the appropriate xsi:type attribute value.

<xsd:complexType name="B">  
      <xsd:complexContent>
                <xsd:element name="options" type="ex_options"/>
      </xsd:complexContent>
</xsd:complexType>

<xsd:complexType name="options">
      <xsd:sequence>
              ...some options
      </xsd:sequence>
</xsd:element>

<xsd:complexType name="ex_options">
      <xsd:complexContent>
             <xsd:extension base="options">
                   <xsd:sequence>
                        ...some more options
                    </xsd:sequence>
              </xsd:extension>
       </xsd:complexContent>
</xsd:element>

然后将其实例元素装饰"为任意一个

and then "decorate" your instance element as either

<options xsi:type="ex_options"> ...     (this will work)

或

<options xsi:type="options"> ...     (I think you can do this as long as the base xsi:type is not abstract)

如果事实证明您无法使用基本的xsi:type装饰， 那么您总是可以通过创建一个空的基本类型来作弊"，然后 通过精心的构造来扩展，以达到您想要的两种格式.

If it turns out that you can't decorate with the base xsi:type, then you can always "cheat" by creating an empty base type and then extending by careful construction to arrive at your two desired formats.

请参见这篇文章以进行详细说明&链接.

See this post for more elaboration & links.

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