title: usecase of metatype attribute in felix scr annotations
body: <p>I am using scr annotations in my project. Can anybody explain the usecase of metatype attribute in @Component annotation?</p>
  
  <pre><code>import org.apache.felix.scr.annotations.Activate;
  import org.apache.felix.scr.annotations.Component;
  import org.apache.felix.scr.annotations.Reference;
  import org.apache.felix.scr.annotations.ReferenceCardinality;
  import org.apache.felix.scr.annotations.ReferencePolicy;
  import org.apache.felix.scr.annotations.Service;
      @Component (name = "SampleComponent", label = "TestLabel", description = "This is a test application", ds = true, immediate = false, metatype = true, factory = "com.java.test.sampleComponent")
      @Service
  </code></pre>