maxOccurs 为无界，但不要考虑元素的顺序 (xs:all) [英] maxOccurs as unbounded, but don't think of order of elements (xs:all)

问题描述

我有一个 XSD 文件，其中有以下情况:

I have a XSD file in which I have the following situation:

<xs:element name='test'>
  <xs:complexType>
   <xs:all>
    <xs:element ref='el1' minOccurs='0' maxOccurs='1'/>
    <xs:element ref='el2' minOccurs='0' maxOccurs='1'/>
    <xs:element ref='el3' minOccurs='0' maxOccurs='1'/>
    <xs:element ref='el4' minOccurs='0' maxOccurs='1'/>
    <xs:element ref='el5' minOccurs='0' maxOccurs='1'/>
    <xs:element ref='el6' minOccurs='0' maxOccurs='1'/>
    <xs:element ref='el7' minOccurs='0' maxOccurs='1'/>    
    <xs:element ref='el8' minOccurs='0' maxOccurs='unbounded'/>  
   </xs:all>
   <xs:attribute name='attr1' use='optional' type='yesno'/>
  </xs:complexType>
 </xs:element>

现在的问题是，到目前为止这还行不通，因为我不能在 all 元素中包含 maxOccurs='unbounded'.有什么办法可以实现这一点，例如使用 xs:choice?

And now the problem is, this isn't working so far, cause I can't have maxOccurs='unbounded' within the all element. Is there any way to achieve this, e.g. with using xs:choice?

推荐答案

为了保留您想要的基数，XSD 1.0 中的唯一方法是用另一个重复元素包装您的重复元素，如下所示:

To preserve the cardinality you want, the only way in XSD 1.0 is to wrap your repeating element with another one, like so:

<xs:element name='test'>
    <xs:complexType>
        <xs:all>
            <xs:element ref='el1' minOccurs='0'/>
            <xs:element ref='el2' minOccurs='0'/>
            <xs:element ref='el3' minOccurs='0'/>
            <xs:element ref='el4' minOccurs='0'/>
            <xs:element ref='el5' minOccurs='0'/>
            <xs:element ref='el6' minOccurs='0'/>
            <xs:element ref='el7' minOccurs='0'/>
            <xs:element ref='el8w' minOccurs='0'/>
        </xs:all>
        <xs:attribute name='attr1' type='yesno'/>
    </xs:complexType>
</xs:element>
<xs:element name="el8w">
    <xs:complexType>
        <xs:sequence>
            <xs:element ref="el8" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>
</xs:element>

模仿 xs:all 的(重复)选择(即允许散布具有指定基数的元素)不能强制出现单个粒子.

The (repeating) choice that would mimic the xs:all (i.e. allow for interspersed elements with the indicated cardinality) can't enforce the occurrence of individual particles.

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