restruction based on string type
File: Data.xml
<?xml version="1.0"?>
<data xmlns="http://www.java2s.com"
xmlns:ex="http://www.java2s.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation=
"http://www.java2s.com
Schema.xsd">
<aircraft>F-16</aircraft>
</data>
File: Schema.xsd
<?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="data">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="aircraft" maxOccurs="2">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:enumeration value="Boeing 747"/>
<xsd:enumeration value="F-16"/>
<xsd:enumeration value="A-10"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
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