<plugin>
                <groupId>org.codehaus.cargo</groupId>
                <artifactId>cargo-maven2-plugin</artifactId>
                <version>1.6.4</version>
                <configuration>
                    <container>
                        <containerId>tomee7x</containerId>
                        <dependencies>
                            <dependency>
                                <!-- It seems the dependency must also be present,
                                     with version, in the main dependency section of the pom.
                                -->
                                <groupId>org.postgresql</groupId>
                                <artifactId>postgresql</artifactId>
                            </dependency>
                        </dependencies>
                    </container>
                    <!-- The two nested configuration elements cause much confusion -->
                    <configuration>
                        <datasources>
                          <datasource>
                              <jndiName>jdbc/foo</jndiName>
                              <driverClass>org.postgresql.Driver</driverClass>
                              <url>localhost:5432/foo</url>
                              <username>foo</username>
                              <password>foo</password>
                              <id>foo</id>
                          </datasource>
                        </datasources>
                        <!-- Alternative (equivalent?) way of specifying datasources. -->
                        <!--
                        <properties>
                            <cargo.datasource.datasource.foo1>
                                cargo.datasource.driver=org.postgresql.Driver|
                                cargo.datasource.url=localhost:5432/foo|
                                cargo.datasource.jndi=jdbc/foo|
                                cargo.datasource.username=foo|
                                cargo.datasource.password=foo
                            </cargo.datasource.datasource.foo1>
                        </properties>
                        -->
                    </configuration>
                    <deployables>
                    </deployables>
                  </configuration>
              </plugin>