XSD (XML Schema Definition)

An XML Schema describes the structure of an XML document.

The purpose of an XML Schema is to define the legal building blocks of an XML document, just like a DTD.

An XML Schema:

• defines elements that can appear in a document
• defines attributes that can appear in a document
• defines which elements are child elements
• defines the order of child elements
• defines the number of child elements
• defines whether an element is empty or can include text
• defines data types for elements and attributes
• defines default and fixed values for elements and attributes

dog.xsd

<?xml version="1.0" encoding="UTF-8"?>

<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.consultants.com/it"

xmlns:tns="http://www.consultants.com/it" elementFormDefault="qualified">

<element name="cdogs" type="tns:Dogs"/>

<element name="dogs" type="tns:Dogs"/>

<complexType name="Dogs">

<sequence>

<element name="dog" type="tns:Dog" maxOccurs="5" minOccurs="0"/>

</sequence>

</complexType>

<complexType name="Dog">

<sequence>

    <element name="name" type="string" maxOccurs="1" minOccurs="1"/>

     <element name="age" type="int" maxOccurs="1" minOccurs="1"/>

</sequence>

<attribute  name="color" type="string"  use="required"/>

 <attribute  name="mobile" type="string"  use="required"/>

</complexType>

</schema>

dog.xml

<?xml version="1.0" encoding="UTF-8"?>
<dogs xmlns="http://www.consultants.com/it" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.consultants.com/it dogs.xsd">
   <dog color="red" mobile="939393939">
    <name>name</name>
  <age>11</age>
   </dog>
   
   <dog color="pink"  mobile="93939393">
    <name>name</name>
  <age>22</age>
   </dog>
   
   
   <dog color="blue"  mobile="939393939">
    <name>name</name>
  <age>33</age>
   </dog>
   
   
   <dog color="pink" mobile="939393939">
    <name>name</name>
  <age>44</age>
   </dog>
   
   <dog color="yellow" mobile="939393939">
    <name>name</name>
  <age>55</age>
   </dog>
  
</dogs>