XSD - 允许元素类型为整数或为空 [英] XSD - allow element type as integer OR empty

问题描述

我需要能够将简单元素类型设置为整数，但也允许它为空.如果此示例为空且空白字段不是整数，则此示例发送错误.我怎样才能绕过这个?

I need to be able to set a simple element type as an integer but allow it to also be empty. This example sends an error if its empty and a blank field is not an integer. How can I get round this?

<xsd:element name="weight" type="xsd:integer"/>

推荐答案

你要做的就是对同一个元素分配限制，并在它们上建立一个联合，例如下面的例子:

What you have to do is assign restrictions on the same element plus make a union on them such as the following example:

<xs:element name="job_code">
  <xs:simpleType>
    <xs:union>
      <xs:simpleType>
        <xs:restriction base='xs:string'>
          <xs:length value="0"/>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base='xs:integer' />
      </xs:simpleType>
    </xs:union>
  </xs:simpleType>
</xs:element>

通过使用此限制，您可以告诉 xml 验证允许任何整数值，如果元素为空，则允许该元素.

By using this restriction, you tell the xml validation to allow any integer value and allowing the element if it is empty.

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