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="campaign_start" type="xs:month" /> </xs:schema> File: Data.xml <?xml version="1.0"?> <campaign_start>1999-03</campaign_start>