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Unless you specify, an attribute is always optional.
You can predefine an attribute's content with a fixed value or a default value.
File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.java2java.com" xmlns="http://www.java2java.com"
elementFormDefault="qualified">
<xsd:element name="source">
<xsd:complexType>
<xsd:complexContent>
<xsd:extension base="xsd:anyType">
<xsd:attribute name="sectionid" type="xsd:string"
use="required" />
<xsd:attribute name="newspaperid" type="xsd:string" />
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
</xsd:element>
</xsd:schema>
File: Data.xml
<?xml version="1.0"?>
<source xmlns="http://www.java2java.com"
sectionid="101"
newspaperid="21"/>
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