<dependency>
  <groupId>org.apache</groupId>
  <artifactId>apache.</artifactId>
  <version>21</version>
  <type>pom</type>
</dependency>

'org.apache:apache.:pom:21'

<dependency org="org.apache" name="apache." rev="21">
  <artifact name="apache." type="pom" />
</dependency>

@Grapes(
@Grab(group='org.apache', module='apache.', version='21')
)

compile 'org.apache:apache.:21'

libraryDependencies += "org.apache" % "apache." % "21"

[org.apache/apache. "21"]