union Based on xs:NMTOKEN
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"
>
1234567890
</data>
File: Schema.xsd
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.java2s.com" xmlns="http://www.java2s.com"
elementFormDefault="qualified">
<xs:element name="data" type="myIntegerUnion"/>
<xs:simpleType name="myIntegerUnion">
<xs:union memberTypes="xs:integer">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="undefined" />
</xs:restriction>
</xs:simpleType>
</xs:union>
</xs:simpleType>
</xs:schema>
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