XML Tutorial/XML Schema/Salami Slice

An XML Schema Document Using Named Type Definitions

   <source lang="xml">

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

 elementFormDefault="qualified"
 targetNamespace="http://www.wbex.ru/namespaces/pub"
 xmlns="http://www.wbex.ru/namespaces/pub">
 <xsd:simpleType name="isbnType">
   <xsd:restriction base="xsd:string">
     <xsd:pattern value="[0-9]{10}" />
   </xsd:restriction>
 </xsd:simpleType>
 <xsd:complexType name="pubType">
   <xsd:sequence>
     <xsd:element ref="book" />
   </xsd:sequence>
 </xsd:complexType>
 <xsd:complexType name="bookType">
   <xsd:sequence>
     <xsd:element ref="title" />
     <xsd:element ref="author" />
     <xsd:element ref="description" />
   </xsd:sequence>
 </xsd:complexType>
 <xsd:element name="publications" type="pubType" />
 <xsd:element name="book" type="bookType" maxOccurs="unbounded" />
 <xsd:element name="title" type="xsd:string" />
 <xsd:element name="author" type="xsd:string" />
 <xsd:element name="description" type="xsd:string" />

</xsd:schema></source>

extend the complex type that we have defined, creating new types for Customer and Employee:

   <source lang="xml">

<?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"

 targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
 elementFormDefault="qualified">
   <xs:complexType name = "PersonType">
      <xs:sequence>
         <xs:element name = "Name" type = "xs:string" />
         <xs:element name = "Address" type = "xs:string" />
         <xs:element name = "Econtact" type = "xs:string" />
      </xs:sequence>
   </xs:complexType>
      
   <xs:element name = "Customer">
      <xs:complexType>
      <xs:complexContent>
         <xs:extension base = "PersonType">
            <xs:sequence>
               <xs:element name = "AccountDetails" type = "xs:string" />
            </xs:sequence>
            <xs:attribute name = "customerID" type = "xs:string" />
         </xs:extension>
      </xs:complexContent>
      </xs:complexType>
   </xs:element>
      
   <xs:element name = "Employee">
      <xs:complexType>
      <xs:complexContent>
         <xs:extension base = "PersonType">
            <xs:sequence>
               <xs:element name = "JobRole" type = "xs:string" />
               <xs:element name = "Department" type = "xs:string" />
            </xs:sequence>
         </xs:extension>
      </xs:complexContent>
      </xs:complexType>
   </xs:element>

</xs:schema></source>

how XML Schema allows us to re-use names, and give them different content models.

   <source lang="xml">

<?xml version = "1.0" ?> <xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema"

          targetNamespace = "http://www.wbex.ru/books"
          xmlns:book = "http://www.wbex.ru/books"
          elementFormDefault = "qualified">
  
  <xs:element name = "Book">
     <xs:complexType>
        <xs:sequence>
           <xs:element name="TitleInformation" type = "book:TitleInformationType" />
           <xs:element name="Chapter" type = "book:ChapterType" minOccurs = "1" maxOccurs = "unbounded" />
        </xs:sequence>
     </xs:complexType>
  </xs:element>
  
  <xs:complexType name = "TitleInformationType">
     <xs:sequence>
        <xs:element name = "Title" type = "xs:string" />
        <xs:element name = "Author" type = "xs:string" />
        <xs:element name = "Publisher" type = "xs:string" />
     </xs:sequence>
  </xs:complexType>
  
  <xs:complexType name = "ChapterType">
     <xs:sequence>
        <xs:element name = "Title">
           <xs:complexType>
              <xs:simpleContent>
                 <xs:extension base = "xs:string">
                    <xs:attribute name = "indexMark" type = "xs:ID" use = "required" />
                 </xs:extension>
              </xs:simpleContent>
           </xs:complexType>
        </xs:element>
     </xs:sequence>
     <xs:attribute name = "chapterNumber" type = "xs:integer" />
  </xs:complexType>
  

</xs:schema></source>

Re-use in Text-only Element Content Models

   <source lang="xml">

File: Schema.xsd <?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"

 targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
 elementFormDefault="qualified">
   <xs:element name = "AccountReviewYear">
      <xs:simpleType>
         <xs:restriction base = "xs:gYear">
            <xs:pattern value="200[1-9]"/>
         </xs:restriction>
      </xs:simpleType>
   </xs:element>
    
   <xs:simpleType name = "fixedLengthFieldType">
      <xs:restriction base = "xs:string">
         <xs:minLength value = "0" />
         <xs:maxLength value = "256" />
      </xs:restriction>
   </xs:simpleType>
      
   <xs:element name = "ClientName" type = "fixedLengthFieldType" />
   <xs:element name = "BranchName" type = "fixedLengthFieldType" />

</xs:schema></source>

Salami Slice design Define global element declarations that are later referenced.

   <source lang="xml">

<xsd:element name="title" type="xsd:string"/> <xsd:element name="author" type="xsd:string"/> <xsd:element name="description" type="xsd:string"/> <xsd:element name="Book">

 <xsd:complexType>
  <xsd:sequence>
  <xsd:element ref="title"/>
   <xsd:element ref="author"/>
   <xsd:element ref="description"/>
  </xsd:sequence>
 </xsd:complexType>

</xsd:element></source>

Schema reuse

   <source lang="xml">

File: Data.xml <?xml version = "1.0" ?> <Customer customerID = "242552">

  <Name>
     <FirstName>A</FirstName>
     <Middle>G</Middle>
     <LastName>C</LastName>
  </Name>
  <Address>
     <Street1>10 Place</Street1>
     <Town>D</Town>
     <City>E</City>
     <State>F</State>
     <Country>Australia</Country>
     <Postcode>2021</Postcode>
  </Address>

</Customer> File: Data2.xml <?xml version = "1.0" ?> <Employee employeeID = "133">

  <Name>
     <FirstName>A</FirstName>
     <Middle>G</Middle>
     <LastName>B</LastName>
  </Name>
  <Address>
     <Street1>10 Place</Street1>
     <Town>small</Town>
     <City>big</City>
     <State>NS</State>
     <Country>Australia</Country>
     <Postcode>2021</Postcode>
  </Address>

</Employee> File: Schema.xsd <?xml version = "1.0" ?> <xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema">

  <xs:element name = "Customer">
     <xs:complexType>
        <xs:sequence>
           <xs:element ref = "Name" />
           <xs:element ref = "Address" />
        </xs:sequence>
        <xs:attribute name = "customerID" type = "integer" />
     </xs:complexType>
  </xs:element>
  
  <xs:element name = "Employee">
     <xs:complexType>
        <xs:sequence>
           <xs:element ref = "Name" />
           <xs:element ref = "Address" />
        </xs:sequence>
        <xs:attribute name = "employeeID" type = "integer" />
     </xs:complexType>
  </xs:element>
  
  <xs:element name = "Name">
     <xs:complexType>
        <xs:sequence>
           <xs:element name = "FirstName" type = "string" />
           <xs:element name = "Middle" type = "string" />
           <xs:element name = "LastName" type = "string" />
        </xs:sequence>
     </xs:complexType>
  </xs:element>
  
  <xs:element name = "Address">
     <xs:complexType>
        <xs:sequence>
           <xs:element name = "Street1" type = "string" />
           <xs:element name = "Town" type = "string" />
           <xs:element name = "City" type = "string" />
           <xs:element name = "State" type = "string" />
           <xs:element name = "Country" type = "string" />
           <xs:element name = "Postcode" type = "string" />
        </xs:sequence>
     </xs:complexType>
  </xs:element>
  

</xs:schema></source>