recommended convention for (groupId/artifactId)-to-(OSGi Bundle-SymbolicName) relationship

[Luke Patterson]

For new projects, which is the "best" convention for the
(groupId/artifactId)-to-(OSGi Bundle-SymbolicName) relationship?

<groupId>someGroupId</groupId>
<artifactId>${project.groupId}.someArtifactId</artifactId>

<someOSGiManifestPluginConfiguration>
  <Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>

or

<groupId>someGroupId</groupId>
<artifactId>someArtifactId</artifactId>

<someOSGiManifestPluginConfiguration>

<Bundle-SymbolicName>${project.groupId}.${project.artifactId}</Bundle-SymbolicName>

or

something else?