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The members of an 'all' group may appear once or not at all, in any order.
The minOccurs and maxOccurs attributes may only be set to 0 or 1.
An all group can only contain individual element declarations or references, not other groups.
An all group can only be contained either a complex type definition or a named group definition.
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="subspecies" type="subspeciesType"/>
<xsd:complexType name="subspeciesType">
<xsd:all>
<xsd:element name="region" type="xsd:string" minOccurs="0" />
<xsd:element name="population" type="xsd:string" />
</xsd:all>
</xsd:complexType>
</xsd:schema>
File: Data.xml
<?xml version="1.0"?>
<subspecies xmlns="http://www.java2java.com">
<population>3159</population>
<region>India</region>
</subspecies>
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