我可以重新定义XSD架构以更改类型子节点的maxOccurs属性吗？

Question

我正在尝试扩展XML模式以更改子元素在元素下发生的次数.

在原始模式中,父类型定义如下:

<xsd:complexType name="CrimeLineBusiness_Type">
    <xsd:complexContent>
        <xsd:extension base="PCLINEBUSINESS">
            <xsd:sequence>
                <xsd:element ref="CrimeSchedule" minOccurs="0"/>
                <xsd:element ref="CrimeMoneyAndSecurities" minOccurs="0"/>
            </xsd:sequence>
        </xsd:extension>
    </xsd:complexContent>
</xsd:complexType>

我想这样做CrimeSchedule并且CrimeMoneyAndSecurities都是重复元素.我认为这可能有用(内部xsd:redefine):

    <xsd:complexType name="CrimeLineBusiness_Type">
        <xsd:complexContent>
            <xsd:extension base="CrimeLineBusiness_Type">
                <xsd:sequence>
                    <xsd:element ref="CrimeMoneyAndSecurities" minOccurs="0" maxOccurs="unbounded"/>
                    <xsd:element ref="CrimeSchedule" minOccurs="0" maxOccurs="unbounded"/>
                </xsd:sequence>
            </xsd:extension>
        </xsd:complexContent>
    </xsd:complexType>

但是,我收到以下错误:

cos-nonambig:CrimeSchedule和CrimeSchedule(或其替换组中的元素)违反了"Unique Particle Attribution".在针对此模式进行验证期间,将为这两个粒子创建歧义.

这是有道理的,因为这些孩子确实是在原始模式中定义的.那么,我怎样才能完成我需要做的事情呢？

谢谢!

Answer 1

进行扩展时,新类型的内容模型是基础内容模型的序列以及您在新类型中添加的内容.例如,在您的情况下,重新定义的CrimeLineBusiness_Type类型的内容模型是

<xsd:sequence>
  <xsd:sequence>
    <xsd:element ref="CrimeSchedule" minOccurs="0"/>
    <xsd:element ref="CrimeMoneyAndSecurities" minOccurs="0"/>
  </xsd:sequence>
  <xsd:sequence>
    <xsd:element ref="CrimeMoneyAndSecurities" minOccurs="0" maxOccurs="unbounded"/>
    <xsd:element ref="CrimeSchedule" minOccurs="0" maxOccurs="unbounded"/>
  </xsd:sequence>
</xsd:sequence>

您可以尝试实现您想要的是对该类型的双重重新定义.首先,您通过限制重新定义它,删除可选的CrimeSchedule和CrimeMoneyAndSecurities元素,然后通过扩展再次添加具有所需出现次数的元素.请参阅下面的完整工作示例:

text.xsd

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <xsd:element name="test" type="CrimeLineBusiness_Type"/>

  <xsd:complexType name="PCLINEBUSINESS"/>
  <xsd:element name="CrimeSchedule"/>
  <xsd:element name="CrimeMoneyAndSecurities"/>

  <xsd:complexType name="CrimeLineBusiness_Type">
    <xsd:complexContent>
      <xsd:extension base="PCLINEBUSINESS">
        <xsd:sequence>
          <xsd:element ref="CrimeSchedule" minOccurs="0"/>
          <xsd:element ref="CrimeMoneyAndSecurities" minOccurs="0"/>
        </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

</xsd:schema>

redef1.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:redefine schemaLocation="test.xsd">

    <xs:complexType name="CrimeLineBusiness_Type">
      <xs:complexContent>
        <xs:restriction base="CrimeLineBusiness_Type">
          <xs:sequence/>
        </xs:restriction>
      </xs:complexContent>
    </xs:complexType>
  </xs:redefine>
</xs:schema>

redef2.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:redefine schemaLocation="redef1.xsd">
    <xs:complexType name="CrimeLineBusiness_Type">
      <xs:complexContent>
        <xs:extension base="CrimeLineBusiness_Type">
          <xs:sequence>
            <xs:element maxOccurs="unbounded" minOccurs="0" ref="CrimeSchedule"/>
            <xs:element maxOccurs="unbounded" minOccurs="0" ref="CrimeMoneyAndSecurities"/>
          </xs:sequence>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:redefine>
</xs:schema>

一个有效的XML实例test.xml

<?xml version="1.0" encoding="UTF-8"?>
<test xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:noNamespaceSchemaLocation="redef2.xsd">

  <CrimeSchedule></CrimeSchedule>
  <CrimeSchedule></CrimeSchedule>
  <CrimeMoneyAndSecurities></CrimeMoneyAndSecurities>
  <CrimeMoneyAndSecurities></CrimeMoneyAndSecurities>

</test>

问候,乔治