File: Schema.xml <?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="population" type="xs:nonNegativeInteger" /> </xs:schema> File: Data.xml <?xml version="1.0"?> <population xmlns="http://www.java2s.com">342</population>