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Default value is one of the value in restriction

File: Data.xml <?xml version="1.0"?> <images xmlns="http://www.rntsoft.com"                    xmlns:i="http://www.rntsoft.com"                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"                    xsi:schemaLocation= "http://www.rntsoft.com Schema.xsd">     <image/>                                                       <image i:src="http://www.rntsoft.com/style/logo.png"/>  </images> File: Schema.xml <?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"             targetNamespace="http://www.rntsoft.com"             xmlns="http://www.rntsoft.com"             elementFormDefault="qualified">     <xsd:element name="image">         <xsd:complexType>             <xsd:attribute ref="src" default="http://www.rntsoft.com"/>         </xsd:complexType>     </xsd:element>     <xsd:attribute name="src">         <xsd:simpleType>             <xsd:restriction base="xsd:anyURI">                 <xsd:enumeration value="http://www.rntsoft.com"/>                 <xsd:enumeration value="http://www.rntsoft.com/style/logo.png"/>                 <xsd:enumeration value="http://www.rntsoft.com/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>