<project>
  ...
  <packaging>jar</packaging>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>xfire-maven-plugin</artifactId>
        <executions>
           <execution>
              <phase>test-compile</phase>
              <goals>
                 <goal>wsdlgen</goal>
              </goals>
           </execution>
        </executions>
        <!-- this shows the default -->
        <configuration>
          <outputDirectory>${project.build.directory}/generated-sources/xfire/wsdlgen</outputDirectory>
          <configs>
            <wsdl>${basedir}/src/main/resources/META-INF/xfire/services.xml</wsdl>
          </configs>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

<project>
  ...
  <packaging>jar</packaging>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>xfire-maven-plugin</artifactId>
        <executions>
           <execution>
              <goals>
                 <goal>wsgen</goal>
              </goals>
           </execution>
        </executions>
        <configuration>
          <package>com.example.ws</package>
          <profile></profile>
          <binding></binding>
          <outputDirectory>${project.build.directory}/client</outputDirectory>
          <wsdls>
            <wsdl>${basedir}/src/wsdl/TheService.wsdl</wsdl>
          </wsdls>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>