<dependency>
  <groupId>org.apache.archiva</groupId>
  <artifactId>metadata</artifactId>
  <version>2.2.8</version>
  <type>pom</type>
</dependency>

'org.apache.archiva:metadata:pom:2.2.8'

<dependency org="org.apache.archiva" name="metadata" rev="2.2.8">
  <artifact name="metadata" type="pom" />
</dependency>

@Grapes(
@Grab(group='org.apache.archiva', module='metadata', version='2.2.8')
)

compile 'org.apache.archiva:metadata:2.2.8'

[org.apache.archiva/metadata "2.2.8"]

libraryDependencies += "org.apache.archiva" % "metadata" % "2.2.8"