are you using WsImport with Maven or ANT ?
if yes,
the schema location should be configured in the plugin..
example if you are compiling a WSDL:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxws-maven-plugin</artifactId>
<executions>
<execution>
<id>business</id>
<goals>
<goal>wsimport</goal>
</goals>
<configuration>
<wsdlDirectory>${resources}/META-INF/wsdl</wsdlDirectory>
<wsdlFiles>
<wsdlFile>cejug-classifieds-business.wsdl
</wsdlFile>
<wsdlFile>cejug-classifieds-admin.wsdl
</wsdlFile>
</wsdlFiles>
<sourceDestDir>src/main/generated
</sourceDestDir>
<verbose>false</verbose>
<genWsdl>false</genWsdl>
<keep>true</keep>
<extension>true</extension>
<debug>true</debug>
<xnocompile>false</xnocompile>
<wsdlLocation>
http://fgaucho.dyndns.org:8080/CejugClassifiedsServiceBusiness/BusinessEndpointDecorator?wsdl</wsdlLocation>
</configuration>
</execution>
<execution>
<id>admin</id>
<goals>
<goal>wsimport</goal>
</goals>
<configuration>
<wsdlDirectory>${resources}/META-INF/wsdl</wsdlDirectory>
<wsdlFiles>
<wsdlFile>cejug-classifieds-admin.wsdl
</wsdlFile>
</wsdlFiles>
<sourceDestDir>src/main/generated
</sourceDestDir>
<verbose>false</verbose>
<genWsdl>false</genWsdl>
<keep>true</keep>
<extension>true</extension>
<debug>true</debug>
<xnocompile>false</xnocompile>
<wsdlLocation>
http://fgaucho.dyndns.org:8080/CejugClassifiedsServiceAdmin/AdminEndpointDecorator?wsdl</wsdlLocation>
</configuration>
</execution>
</executions>
</plugin>
and I have an example of XSD somewhere.. but you can google for it........