XML/XML Schema/default

default value is one of the value in restriction

   <source lang="xml">

File: Data.xml <?xml version="1.0"?> <images xmlns="http://www.wbex.ru"

                  xmlns:i="http://www.wbex.ru"
                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                  xsi:schemaLocation= "http://www.wbex.ru Schema.xsd">
   <image/>                                                  
   <image i:src="http://www.wbex.ru/style/logo.png"/> 

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

           targetNamespace="http://www.wbex.ru"
           xmlns="http://www.wbex.ru"
           elementFormDefault="qualified">
   <xsd:element name="image">
       <xsd:complexType>
           <xsd:attribute ref="src" default="http://www.wbex.ru"/>
       </xsd:complexType>
   </xsd:element>
   <xsd:attribute name="src">
       <xsd:simpleType>
           <xsd:restriction base="xsd:anyURI">
               <xsd:enumeration value="http://www.wbex.ru"/>
               <xsd:enumeration value="http://www.wbex.ru/style/logo.png"/>
               <xsd:enumeration value="http://www.wbex.ru/isbn.html"/>
           </xsd:restriction>
       </xsd:simpleType>
   </xsd:attribute>
   <xsd:element name="images">
       <xsd:complexType>
           <xsd:sequence>
               <xsd:element ref="image" maxOccurs="2"/>
           </xsd:sequence>
       </xsd:complexType>
   </xsd:element>

</xsd:schema>

</source>
   
  

Element with default value

   <source lang="xml">

File: Data.xml <?xml version="1.0"?> <airport xmlns="http://www.wbex.ru"

                  xmlns:ex="http://www.wbex.ru"
                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                  xsi:schemaLocation= "http://www.wbex.ru Schema.xsd">
   <aircraft/>
   <aircraft>F-16</aircraft>

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

           targetNamespace="http://www.wbex.ru"
           xmlns="http://www.wbex.ru"
           elementFormDefault="qualified">
   <xsd:element name="airport">
       <xsd:complexType>
           <xsd:sequence>
               <xsd:element name="aircraft" default="Boeing 747"  maxOccurs="2" type="xsd:string"/>
           </xsd:sequence>
       </xsd:complexType>
   </xsd:element>

</xsd:schema>

</source>