org.eclipse.sisu.plexus.tests/META-INF/plexus/variable_components.xml

<component-set>

  <components>
    <component>
      <implementation>
        org.eclipse.sisu.plexus.PlexusXmlScannerTest$DefaultBean
      </implementation>
      <configuration>
        <prefix>foo</prefix>
        <variable>${some.value}</variable>
        <suffix>bar</suffix>
      </configuration>
    </component>
    <component>
      <role-hint>
        debug
      </role-hint>
      <implementation>
        org.eclipse.sisu.plexus.PlexusXmlScannerTest$DefaultBean
      </implementation>
    </component>
    <component>
      <role-hint>
        again
      </role-hint>
      <implementation>
        org.eclipse.sisu.plexus.PlexusXmlScannerTest$DefaultBean
      </implementation>
    </component>
  </components>

</component-set>