允许 XSD 日期元素为空字符串

问题描述

我想允许一个元素是 xs:date 或空字符串.

I would like to allow an element to be a xs:date or an empty string.

这是我尝试过的 XML 架构:

Here's an XML Schema that I've tried:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
           xmlns:lp="urn:oio:ebst:diadem:lokalplan:1" 
           targetNamespace="urn:oio:ebst:diadem:lokalplan:1" 
           elementFormDefault="qualified" xml:lang="DA" 
           xmlns:m="urn:oio:ebst:diadem:metadata:1">
  <xs:import schemaLocation="../key.xsd" namespace="urn:oio:ebst:diadem:metadata:1" />
  <xs:element name="DatoVedtaget" type="lp:DatoVedtagetType" />
  <xs:complexType name="DatoVedtagetType">
    <xs:simpleContent>      
      <xs:extension base="xs:date">
        <xs:attribute ref="m:key" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name="DatoVedtagetTypeString">
    <xs:simpleContent>
      <xs:extension base="xs:string">
        <xs:attribute ref="m:key" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
</xs:schema>

如果元素包含一个值，我希望元素为 DatoVedtagetType，如果它为空，我希望它为 DatoVedtagetTypeString.我如何在这个架构中实现这样的条件功能?

I want the element to be DatoVedtagetType in a case it includes a value, and I want it to be DatoVedtagetTypeString if it is empty. How I implement such a conditional functionality this schema?

推荐答案

根据问题的评论，目标是让 DatoVedtaget 为 xs:date 或为空.这是表达这种约束的一种方式:

Per comments on the question, the goal is to have DatoVedtaget be a xs:date or empty. Here is a way to express such a constraint:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:lp="urn:oio:ebst:diadem:lokalplan:1"
           xmlns:m="urn:oio:ebst:diadem:metadata:1"
           targetNamespace="urn:oio:ebst:diadem:lokalplan:1"
           elementFormDefault="qualified"
           xml:lang="DA">
  <xs:import schemaLocation="../key.xsd" namespace="urn:oio:ebst:diadem:metadata:1" />
  <xs:element name="DatoVedtaget" type="lp:DatoVedtagetType" />

  <xs:simpleType name="empty">
    <xs:restriction base="xs:string">
      <xs:enumeration value=""/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="dateOrEmpty">
    <xs:union memberTypes="xs:date lp:empty"/>
  </xs:simpleType>  

  <xs:complexType name="DatoVedtagetType">
    <xs:simpleContent>
      <xs:extension base="lp:dateOrEmpty">
        <xs:attribute ref="m:key" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

</xs:schema>

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