扩展XML模式xs:choice [英] Extending XML Schema xs:choice

问题描述

我正在开发可通过XML配置并可以通过PowerShell模块扩展的构建工具.我有一个XSD( http://download.crawler-lib.net/BuildTools/BuildConfig. xsd )，它描述了开箱即用的功能.一个扩展点是构建序列的工具:

I'm developing build tools that are configurable via XML and extendable with PowerShell modules. I have an XSD (http://download.crawler-lib.net/BuildTools/BuildConfig.xsd) which describes the out of the box functionality. One extension point are the tools of the build sequences:

  <xs:element name="BuildSequence">
    <xs:annotation>
      <xs:documentation>Performs a sequence of build tools to build the solution</xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:choice maxOccurs="unbounded" minOccurs="0">
        <xs:element ref="bt:AppendText"/>
        <xs:element ref="bt:Autover"/>
        <xs:element ref="bt:Call"/>
        <xs:element ref="bt:CopyFile"/>
        <xs:element ref="bt:Download"/>
        <xs:element ref="bt:DumpContext"/>
        <xs:element ref="bt:FxCop"/>
        <xs:element ref="bt:IntelliLock"/>
        <xs:element ref="bt:MSBuild"/>
        <xs:element ref="bt:NuGetPack"/>
        <xs:element ref="bt:NuGetPush"/>
        <xs:element ref="bt:NUnit"/>
        <xs:element ref="bt:NuSpecUpdate"/>
        <xs:element ref="bt:Powershell"/>
        <xs:element ref="bt:RemoveFile"/>
        <xs:element ref="bt:Upload"/>
        <xs:element ref="bt:VerifyFile"/>
        <xs:element ref="bt:Xslt"/>
        <xs:element ref="bt:Zip"/>
      </xs:choice>
      <xs:attribute name="Name" type="xs:string" use="required"/>
      <xs:attribute name="NewBuild" type="bt:boolean" use="optional"/>
    </xs:complexType>
  </xs:element>

有人可以使用附加的PowerShell模块扩展此功能，该模块定义一个名为"MyTool"的构建步骤工具.因此，在XML配置中，可能还有另一个有效元素，应该在选项列表中，例如:

Someone may extend this with an additional PowerShell module defining a build step tool named "MyTool". So in the XML config there may be another valid element which should be in the list of choices like:

<xs:element ref="custom:MyTool"/>

如何使用附加的(custom.xsd)XSD文件扩展此类定义?这样我就可以在Visual Studio中为自定义元素获取IntelliSense?

How can I extend such a definition with an additional (custom.xsd) XSD file? So that I get IntelliSense in Visual Studio for the custom element?

推荐答案

考虑使用替代组.如果您的内容模型允许元素E，则它还允许E替换组中的任何元素；否则，它不支持元素E.任何人都可以创建这样的元素(除非您将其阻止)，并且该元素会自动变为可用，而无需更改您的内容模型.

Consider using substitution groups. If your content model allows element E, then it also allows any element that is in the substitution group of E; anyone can create such an element (unless you block it), and it automatically becomes available without having to change your content model.

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