xsd, bir elemanın sonsuz bir alt öğe olarak kendini bırakmasına ne izin verir?

Question

Sonsuza kadar gidebilen bu tür xml yapısını vermek için nasıl xsd oluşturabilirim? Ben kopyalamak razıyım olarak

<?xml version="1.0" encoding="utf-8" ?> 
<SampleXml> 
    <Items> 
     <Item name="SomeName" type="string"> 
      This would be the value 
     </Item> 
     <Item name="SecondName" type="string"> 
      This is the next string 
     </Item> 
     <Item name="AnotherName" type="list"> 
      <Items> 
       <Item name="SubName" type="string"> 
        A string in a sub list 
       </Item> 
       <Item name="SubSubName" type="list"> 
        <Items> 
         <Item name="HowDoI" type="string"> 
          How do I keep this going infinately? 
         </Item> 
        </Items> 
       </Item> 
      </Items> 
     </Item> 
    </Items> 
</SampleXml> 

bulduğum tek çözüm sadece xsd gibi defalarca tekrarlamak olmuştur. Aşağıda olduğu gibi.

<?xml version="1.0" encoding="utf-8"?> 
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"> 
    <xs:element name="SampleXml"> 
     <xs:complexType> 
      <xs:sequence> 
       <xs:element name="Items"> 
        <xs:complexType> 
         <xs:sequence> 
          <xs:element maxOccurs="unbounded" name="Item"> 
           <xs:complexType mixed="true"> 
            <xs:sequence minOccurs="0"> 
             <xs:element name="Items"> 
              <xs:complexType> 
               <xs:sequence> 
                <xs:element maxOccurs="unbounded" name="Item"> 
                 <xs:complexType mixed="true"> 
                  <xs:sequence minOccurs="0"> 
                   <xs:element name="Items"> 
                    <xs:complexType> 
                     <xs:sequence> 
                      <xs:element name="Item"> 
                       <xs:complexType> 
                        <xs:simpleContent> 
                         <xs:extension base="xs:string"> 
                          <xs:attribute name="name" type="xs:string" use="required" /> 
                          <xs:attribute name="type" type="xs:string" use="required" /> 
                         </xs:extension> 
                        </xs:simpleContent> 
                       </xs:complexType> 
                      </xs:element> 
                     </xs:sequence> 
                    </xs:complexType> 
                   </xs:element> 
                  </xs:sequence> 
                  <xs:attribute name="name" type="xs:string" use="required" /> 
                  <xs:attribute name="type" type="xs:string" use="required" /> 
                 </xs:complexType> 
                </xs:element> 
               </xs:sequence> 
              </xs:complexType> 
             </xs:element> 
            </xs:sequence> 
            <xs:attribute name="name" type="xs:string" use="required" /> 
            <xs:attribute name="type" type="xs:string" use="required" /> 
           </xs:complexType> 
          </xs:element> 
         </xs:sequence> 
        </xs:complexType> 
       </xs:element> 
      </xs:sequence> 
     </xs:complexType> 
    </xs:element> 
</xs:schema> 

Answer 1

Kullanım <xs:element ref="bla" /> yinelemeli parçalara atıfta bulunmak için. Basit bir örnek:

<xs:element name="recursive"> 
    <xs:complexType> 
    <xs:sequence> 
     <xs:element ref="recursive" minOccurs="0" maxOccurs="unbounded" /> 
    </xs:sequence> 
    </xs:complexType> 
</xs:element> 

bu yazmasına izin verir: 'ref' özelliğinin

<recursive> 
    <recursive> 
    <recursive /> 
    </recursive> 
    <recursive /> 
    <recursive> 
    <recursive> 
     <recursive /> 
    </recursive> 
    </recursive> 
</recursive> 

Kullanımı da XSD'nin okunabilirliği artırmada büyük ölçüde yardımcı olur. Bu seninkini yazmak görecektir:

<?xml version="1.0" encoding="utf-8"?> 
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"> 

    <xs:element name="SampleXml"> 
    <xs:complexType> 
     <xs:sequence> 
     <xs:element ref="Items" /> 
     </xs:sequence> 
    </xs:complexType> 
    </xs:element> 

    <xs:element name="Items"> 
    <xs:complexType> 
     <xs:sequence> 
     <xs:element ref="Item" maxOccurs="unbounded" /> 
     </xs:sequence> 
    </xs:complexType> 
    </xs:element> 

    <xs:element name="Item"> 
    <xs:complexType mixed="true"> 
     <xs:sequence> 
     <xs:element ref="Items" minOccurs="0" /> 
     </xs:sequence> 
     <xs:attribute name="name" type="xs:string" use="required" /> 
     <xs:attribute name="type" type="xs:string" use="required" /> 
    </xs:complexType> 
    </xs:element> 

</xs:schema> 

Not onu kesinlikle gerekli olmasa bile 'ref' kullanımı (örneğin SampleXml Öğeler başvurduğunda gibi) XSD iç içe geçmiş bir karmaşa daha az ve daha okunabilir hale nasıl.

Answer 2

ref özelliğini kullanmak, böyle bir şey deneyin:

<xs:element name="Items"> 
    <xs:complexType> 
    <xs:sequence minOccurs="0" maxOccurs="unbounded"> 
     <xs:element ref="Item" /> 
    </xs:sequence> 
    </xd:complexType 
</xd:element> 

<xs:element name="Item"> 
    <xs:complexType> 
    <xs:sequence> 
     <xs:element ref="Items" /> 
    </xs:sequence> 
    </xd:complexType 
</xd:element> 

Answer 3

deneyin ref özelliğini kullanarak:

<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"> 
    <xs:element name="Items"> 
     <xs:complexType> 
      <xs:sequence> 
       <xs:element maxOccurs="unbounded" name="Item"> 
        <xs:complexType mixed="true"> 
         <xs:sequence minOccurs="0"> 
          <xs:element ref="Items" /> 
         </xs:sequence> 
         <xs:attribute name="name" type="xs:string" use="required" /> 
         <xs:attribute name="type" type="xs:string" use="required" /> 
        </xs:complexType> 
       </xs:element> 
      </xs:sequence> 
     </xs:complexType> 
    </xs:element> 
    <xs:element name="SampleXml"> 
     <xs:complexType> 
      <xs:sequence> 
       <xs:element ref="Items" /> 
      </xs:sequence> 
     </xs:complexType> 
    </xs:element> 
</xs:schema>