[Dúvida] Configurando pom.xml plugin maven tomcat7

Tentando buildar um servlet simples web, para exercitar o processo de build com maven, estou usando o plugin do tomcat7 para isso, porém ele pede para configurar as seguintes tags que eu não sei o que colocar.

 <warRunDependencies>

    <warRunDependency>
        <dependency>
                <groupId>a groupId</groupId>
                <artifactId>and artifactId</artifactId>
                <version>version</version>
                <type>war</type>
        </dependency>
        <contextPath>/</contextPath>
    </warRunDependency>

  </warRunDependencies>

Essas dependencias são referentes ao o meu artefato? Sao referentes as dependencias que meu artefato usa? As documentações muitas vezes são pobres nesse detalhes.

Segue todas as configs no pom.xml que o tomcat recomenda para este processo.

<project>
  ...
  <packaging>war</packaging>
  ...
  <build>
    ...
    <plugins>
      ...
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.3-SNAPSHOT</version>
        <executions>
          <execution>
            <id>tomcat-run</id>
            <goals>
              <goal>exec-war-only</goal>
            </goals>
            <phase>package</phase>
            <configuration>
              <!-- optional only if you want to use a preconfigured server.xml file -->
              <!--
              <serverXml>src/main/tomcatconf/server.xml</serverXml>
              -->
              <warRunDependencies>
                <warRunDependency>
                  <dependency>
                    <groupId>a groupId</groupId>
                    <artifactId>and artifactId</artifactId>
                    <version>version</version>
                    <type>war</type>
                  </dependency>
                  <contextPath>/</contextPath>
                </warRunDependency>
              </warRunDependencies>
              <!-- naming is disabled by default so use true to enable it -->
              <enableNaming>true</enableNaming>
              <!-- extra dependencies to add jdbc driver, mail jars, etc. -->
              <extraDependencies>
                <extraDependency>
                  <groupId>org.apache.derby</groupId>
                  <artifactId>derby</artifactId>
                  <version>10.1.3.1</version>
                </extraDependency>
                <extraDependency>
                  <groupId>javax.mail</groupId>
                  <artifactId>mail</artifactId>
                  <version>1.4</version>
                </extraDependency>
              </extraDependencies>
            </configuration>
          </execution>
        </executions>
      </plugin>
      ...
    </plugins>
    ...
  </build>
  ...
</project>