Example of using executions in your pom

gistfile1.xml

  <build>
    <plugins>
      <plugin>
	<groupId>com.rackspace.cloud.api</groupId>
	<artifactId>clouddocs-maven-plugin</artifactId>
	<version>1.0.10</version>
	<executions>
	  <execution>
	    <id>g1</id>
	    <goals>
	      <goal>generate-pdf</goal>
	      <goal>generate-webhelp</goal>
	    </goals>
	    <phase>generate-sources</phase>
	    <configuration>
	      <includes>
		doc1.xml
	      </includes>
	      <!-- put any doc specific config here, e.g.: -->
              <security>internal</security>
	    </configuration>
	  </execution>
	  <execution>
	    <id>g2</id>
	    <goals>
	      <goal>generate-pdf</goal>
	      <goal>generate-webhelp</goal>
	    </goals>
	    <phase>generate-sources</phase>
	    <configuration>
	      <includes>
		doc2.xml,doc3.xml
	      </includes>
	      <!-- put any doc specific config here -->
	    </configuration>
	  </execution>
	</executions>
	<configuration>
	  <xincludeSupported>true</xincludeSupported>
	  <!-- General config here -->
	</configuration>
      </plugin>
    </plugins>
  </build>

I wish I could comment on individual lines like I can on commits. Note that the <id> for each <execution> has to be unique in the pom. You can have as many <execution>s as you want. Each can have its own <configuration>. The <configuration> at the bottom (at the <plugin> level) applies to all the <execution>s unless overridden in that <execution>'s <configuration>.