reference type as attribute type and default value
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/style/logo.png"/>
</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" default="http://www.java2s.com"/>
</xsd:complexType>
</xsd:element>
<xsd:attribute name="src" type="xsd:anyURI"/>
<xsd:element name="images">
<xsd:complexType>
<xsd:sequence>
<xsd:element ref="image" maxOccurs="2"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
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