Define a comma-separated list ignoring whitespaces between values and commas
<?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:simpleType name="myType">
<xs:restriction base="xs:token">
<xs:pattern value="(1|2|3)( *, *(1|2|3))*" />
</xs:restriction>
</xs:simpleType>
</xs:schema>
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