<?xml version="1.0"?> <schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.java2s.com/namespaces/pub" xmlns:pub="http://www.java2s.com/namespaces/pub" elementFormDefault="qualified"> <include schemaLocation="book.xsd"/> <element name="products"> <complexType> <sequence> <element name="publications"> <complexType> <sequence> <element ref="pub:book" maxOccurs="unbounded"/> </sequence> </complexType> </element> </sequence> </complexType> </element> </schema>