fixed value for attribute type
File: Data.xml <?xml version="1.0"?> <images xmlns="http://www.java2s.com" xmlns:i="http://www.java2s.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.java2s.com Schema.xsd"> <image/> <image i:src="http://www.java2s.com"/> </images> File: Schema.xml <?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.java2s.com" xmlns="http://www.java2s.com" elementFormDefault="qualified"> <xsd:element name="image"> <xsd:complexType> <xsd:attribute ref="src"/> </xsd:complexType> </xsd:element> <xsd:attribute name="src" type="xsd:anyURI" fixed="http://www.java2s.com"/> <xsd:element name="images"> <xsd:complexType> <xsd:sequence> <xsd:element ref="image" maxOccurs="2"/> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema>