mvn snippet to create an rpm for tomcat war

gistfile1.xml

    <pluginManagement>
      <plugins>
        <!-- 
        The RPM plugin is used to create distributable apps from our war file. 
        To use it fire:
        $ mvn install rpm:rpm
        ...
        The resulting rpm is then found at Project/target/rpm/Project/RPMS/noarch/Project-versoin-1.noarch.rpm

        For example: ImageServer/target/rpm/ImageServer/RPMS/noarch/ImageServer-6.5.0-1.noarch.rpm
        -->
        <plugin>
          <groupId>org.codehaus.mojo</groupId>
          <artifactId>rpm-maven-plugin</artifactId>
          <version>2.1-alpha-1</version>
          <configuration>
            <group>outbrain</group>
            <mappings>
              <mapping>
                <directory>${rpm.context.file.target}</directory>
                <configuration>true</configuration>
                <filemode>755</filemode>
                <username>${rpm.file.owner}</username>
                <groupname>${rpm.file.owner}</groupname>
                <sources>
                  <source>
                    <location>${rpm.context.file.source}</location>
                  </source>
                </sources>
              </mapping>
              <mapping>
                <directory>/home/tomcat/wars</directory>
                <filemode>755</filemode>
                <username>${rpm.file.owner}</username>
                <groupname>${rpm.file.owner}</groupname>
                <!-- 
                The following adtifact/classifiers/classifier voodoo is required to get the 
                projects main artifact into the rpm (and only the main artifact, without the 
                test artifact.
                See http://mojo.codehaus.org/rpm-maven-plugin/map-params.html#artifact
                -->
                <artifact>
                  <classifiers>
                    <classifier/>
                  </classifiers>
                </artifact>
              </mapping>
            </mappings>
            <preinstallScriptlet>
              <script>/etc/init.d/tomcat5 stop</script>
            </preinstallScriptlet>
            <postinstallScriptlet>
              <script>
                echo "removing ${apps.deploy.directory}"
                rm -rf ${apps.deploy.directory} 
                echo "removing ${tomcat.work.directory}/*"
                rm -rf ${tomcat.work.directory}/*
                /etc/init.d/tomcat5 start
              </script>
            </postinstallScriptlet>
          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>

What is rpm.context.file.source?
Thanks btw!