/**
  * Get the list of key names for the service's properties.
  *
  * @see org.osgi.framework.ServiceReference#getPropertyKeys
  */
 public String[] getPropertyKeys() {
   return registration.getProperties().keyArray();
 }
 /**
  * Get all properties registered with this service.
  *
  * @return Dictionary containing properties or null if service has been removed.
  */
 PropertiesDictionary getProperties() {
   return registration.getProperties();
 }