2个元素中的元素引用

我有包含以下元素的XSD

<xs:element name="abc"> 
    <xs:complexType> 
    <xs:element maxOccurs="unbounded" ref="ele1"/> 
    </xs:complexType> 
</xs:element> 

<xs:element name="xyz"> 
    <xs:complexType> 
    <xs:element maxOccurs="unbounded" ref="ele1"/> 
    </xs:complexType> 
</xs:element> 

<xs:element name="ele1"> 
    <xs:complexType> 
    <xs:attribute name="ID" type="xs:integer"/> 
    </xs:complexType> 
</xs:element>

的问题是，对于元件xyzID是必需的，而对于abc它不是;我怎样才能在XSD中指定这个？

来源

2012-05-09 Satya Jasti

假设ID是在“容器”重复内容的唯一标识符，那么你可以设置一个XS：键约束的XYZ是这样的：

<?xml version="1.0" encoding="utf-8" ?> 
<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"> 
    <xs:element name="abc"> 
     <xs:complexType> 
      <xs:sequence> 
       <xs:element maxOccurs="unbounded" ref="ele1"/> 
      </xs:sequence> 
     </xs:complexType> 
    </xs:element> 
    <xs:element name="xyz"> 
     <xs:complexType> 
      <xs:sequence> 
       <xs:element maxOccurs="unbounded" ref="ele1"/> 
      </xs:sequence> 
     </xs:complexType> 
     <xs:key name="PK_xyz"> 
      <xs:selector xpath="ele1"/> 
      <xs:field xpath="@ID"/> 
     </xs:key> 
    </xs:element> 
    <xs:element name="ele1"> 
     <xs:complexType> 
      <xs:attribute name="ID" type="xs:integer"/> 
     </xs:complexType> 
    </xs:element> 
</xs:schema>

然后，无效的XML因为ID是失踪：

<?xml version="1.0" encoding="utf-8" standalone="yes"?> 
<!-- Sample XML generated by QTAssistant (http://www.paschidev.com) --> 
<xyz xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 
    <ele1 ID="1"/> 
    <ele1 /> 
</xyz>

错误消息：

Error occurred while loading [], line 5 position 3 
The identity constraint 'PK_xyz' validation has failed. Either a key is missing or the existing key has an empty node. 
Document3.xml is invalid.

无效的，因为它是重复的（这是不利的一面，如果在独特上述假设不成立真）：

<?xml version="1.0" encoding="utf-8" standalone="yes"?> 
<!-- Sample XML generated by QTAssistant (http://www.paschidev.com) --> 
<xyz xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 
    <ele1 ID="1"/> 
    <ele1 ID="1"/> 
</xyz>

错误：

Error occurred while loading [], line 5 position 3 
There is a duplicate key sequence '1' for the 'PK_xyz' key or unique identity constraint. 
Document3.xml is invalid.

工作样本：

<?xml version="1.0" encoding="utf-8" standalone="yes"?> 
<!-- Sample XML generated by QTAssistant (http://www.paschidev.com) --> 
<xyz xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 
    <ele1 ID="1"/> 
    <ele1 ID="2"/> 
</xyz>

来源

2012-05-09 17:14:41

2个元素中的元素引用

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