Why is cxf-xjc-plugin not regenerating source if xsd changes?

[KARR, DAVID]

I've noticed that if I change my XSD and rebuild, using the cxf-xjc-plugin, 
that the source is not regenerated.  If I instead "clean" and rebuild, it 
regenerates the source.  It seems reasonable that it should know to regenerate 
the source if only the xsd changes.  The documentation at 
<http://cxf.apache.org/cxf-xjc-plugin.html> is somewhat ambiguous.  The only 
reference to regenerating source is in the undocumented "dependencies" element. 
 I tried some guesses on what should be in the "dependencies" element.  I got 
it to not fail the build, but it didn't appear to do anything, either.

The following is my approximate plugin declaration.

<plugin>
  <groupId>org.apache.cxf</groupId>
  <artifactId>cxf-xjc-plugin</artifactId>
  <version>2.6.0</version>
  <executions>
    <execution>
      <id>generate-sources</id>
      <phase>generate-sources</phase>
      <goals>
        <goal>xsdtojava</goal>
      </goals>
      <configuration>
        <extensions>
          
<extension>JAXBXMLElementWrapperPlugin:JAXBXMLElementWrapperPlugin:1.0.0</extension>
          
<extension>net.java.dev.jaxb2-commons:jaxb-fluent-api:2.1.8</extension>
        </extensions>
        <xsdOptions>
          <xsdOption>
            
<xsd>${basedir}/src/main/resources/schema/serviceCallResults.xsd</xsd>
            
<packagename>packagepath.service.domain.serviceCallResults</packagename>
            <extension>true</extension>
            <extensionArgs>
              <extensionArg>-Xxew</extensionArg>
              <extensionArg>-summary 
${basedir}/target/xew-summary.txt</extensionArg>
              <extensionArg>-instantiate lazy</extensionArg>
              <extensionArg>-Xfluent-api</extensionArg>
            </extensionArgs>
          </xsdOption>
          ...
        </xsdOptions>
      </configuration>
    </execution>
  </executions>
</plugin>