我可以重新定義一個XSD架構來更改某個類型的子項的maxOccurs屬性嗎？

Question

我想擴展一個XML架構來改變一個元素下一個孩子可以發生的次數。

在原始模式，則父類型被定義爲這樣：

<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> 

我想使它所以無論CrimeSchedule和CrimeMoneyAndSecurities被重複元素。我想這可能工作（內部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> 

然而，然後我得到了以下錯誤：

cos-nonambig: CrimeSchedule and CrimeSchedule (or elements from their substitution group) violate "Unique Particle Attribution". During validation against this schema, ambiguity would be created for those two particles.

這是有道理的，因爲這些孩子們在原來的架構確實定義。那麼，我該如何完成我需要做的事情呢？

謝謝！

Answer 1

當您進行擴展時，新類型的內容模型是基本內容模型的序列，以及您在新類型中添加的內容模型。例如，在你的情況爲重新定義CrimeLineBusiness_Type類型的內容模型是

<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> 

什麼，你可以嘗試達到你想要的是這種類型的雙重新定義。首先，您通過限制重新定義它，刪除可選的CrimeSchedule和CrimeMoneyAndSecurities元素，然後再通過擴展再次添加具有所需出現次數的元素。請參見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> 

一個有效的XML實例的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> 

Regards， George