如何设计在 xml 中存储复杂的对象设置 [英] How to design storing complex object settings in an xml

问题描述

我正在尝试将每个对象状态的自定义设置存储在对象本身上，但我不知道如何以面向对象的方式执行此操作.所以:

I am trying to store custom settings for each objects state on the object itself, but I don't know how I can do this in an object-oriented way. So:

xml 文件中的一个部分是:

One section in the xml file is:

<ObjectType>

可以是Blur, Sharpen, Smooth, 等

但是如果 Blur 的类型是 Blur ，那么它有额外的属性要存储，比如:

But say that Blur has additional properties to be stored only if the type is Blur, like:

<BlurType>Gaussian, Smart, etc</BlurType>

此外，我不确定是否应该将这些存储为:

Also I am not sure if I should store these as:

<a>something</a>

或

<a>Type=something</a>

推荐答案

永远不要在 XML 中存储分隔数据.

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也就是说，永远不要有包含逗号分隔值列表、等号分隔值或类似内容的元素.XML 为您提供了创建列表的机制，如果您打算使用它，则不应重新发明它.

Never store delimited data in XML.

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That is to say, never have an element that contains a list of comma-separated values, or equals-sign-separated values, or anything like that. XML provides for you the mechanism to create lists and you should not reinvent that if you're planning on using it.

XML 方式"像您所说的那样存储列表是这样的:

The "XML way" to store a list like you're talking about is like this:

<BlurType>
  <option>Gaussian</option>
  <option>Smart</option>
  ...
</BlurType>

或者，如果您有一组可以打开或关闭的特定值，

Or, if you have a set of specific values that you can either turn on or off,

<BlurType>
  <Gaussian>true</Gaussian>
  <Smart>true</Smart>
  ...
</BlurType>

第二种方法可以比第一种方法更严格地针对 XSD 进行验证.第一个更灵活.您不想在 XML 中的任何地方存储诸如 type=something 之类的东西.两者之间的中间立场是这样的:

The second method can be validated against an XSD more strictly than the first. The first is more flexible. You don't want to be storing things like type=something anywhere in XML. A middle ground between the two would work like this:

<BlurType>
  <option name="Gaussian">true</option>
  <option name="Smart">true</option>
  ...
</BlurType>

这提供了灵活性，同时您可以根据 XSD 或 DTD.

This offers flexibility and at the same time you can validate the values of the name attribute and option elements against an XSD or DTD.

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