xml 模式将序列和所有都放在一个 complexType 节点下 [英] xml schema putting both sequence and all under one complexType node

问题描述

这里是xml文件:

<section>
    <number>1</number>
    <title>A Title goes here...</title>
    <code>TheCode</code>

    <element></element>
    <element></element>
</section>

在section节点中，有编号、标题和代码节点.它们的顺序不能是固定的.那么，section节点下也有多个元素.

In section node, there are number, title and code node. Their sequence must not be fixed. Then, there are multiple element under section node as well.

我们的想法是使用以下架构:

The idea is to use the following schema:

<xs:complexType name="Type-section">

  <xs:all>
    <xs:element name="number" minOccurs="0"></xs:element>
    <xs:element name="code"  minOccurs="1"></xs:element>
    <xs:element name="title"  minOccurs="1"></xs:element>
  </xs:all>

  <xs:sequence>
    <xs:element maxOccurs="unbounded" name="element"></xs:element>
  </xs:sequence>
</xs:complexType>

但它是无效的.我只是不能将序列"和全部"放在同一级别.我该如何解决?

But it is invalid. I just cant put "sequence" and "all" together in the same level. How can i fix it?

推荐答案

如果顺序不重要，那么您可以这样做的一种方法是列出所有排列并将其作为选择.然而，随着选择数量的增加 O(n!)，它将很难维持.由于 XML Schema 上的这些限制，我不得不为我编写的某些内容恢复顺序.

If the order must not be important, then a way you can do it is to list all the permutations and put it in as a choice. However it is going to be quite hard to maintain as the number of choices grows O(n!). I had to revert to sequence for some of the things I write because of limitations such as these on XML Schema.

例如

<choice>
  <sequence>
    <element name="a" />
    <element name="b" />
    <element name="c" />
  </sequence>

  <sequence>
    <element name="a" />
    <element name="c" />
    <element name="b" />
  </sequence>


  <sequence>
    <element name="b" />
    <element name="a" />
    <element name="c" />
  </sequence>


  <sequence>
    <element name="b" />
    <element name="c" />
    <element name="a" />
  </sequence>


  <sequence>
    <element name="c" />
    <element name="a" />
    <element name="b" />
  </sequence>


  <sequence>
    <element name="c" />
    <element name="b" />
    <element name="a" />
  </sequence>
</choice>

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