xs:enumeration allows definition of a list of possible values as well as works on the value space
File: Data.xml
<?xml version="1.0"?>
<data xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.java2s.com Schema.xsd"
xmlns="http://www.java2s.com"
>
2001
</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" type="myDates"/>
<xsd:simpleType name="myDates">
<xsd:restriction base="xsd:gYear">
<xsd:enumeration value="2001" />
<xsd:enumeration value="2002" />
<xsd:enumeration value="2003" />
</xsd:restriction>
</xsd:simpleType>
</xsd:schema>
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