code: @Override
  	public String getAttribute(String name) {
  		final String sourceMethod = "getAttribute"; //$NON-NLS-1$
  		boolean isTraceLogging = log.isLoggable(Level.FINER);
  		if (isTraceLogging) {
  			log.entering(AggregatorExtension.class.getName(), sourceMethod, new Object[]{name});
  		}
  		String result = attributes.getProperty(name);
  		if (result != null && aggregator != null) {
  			result = aggregator.substituteProps(result);
  		}
  		if (isTraceLogging) {
  			log.exiting(AggregatorExtension.class.getName(), sourceMethod, result);
  		}
  		return result;
  	}
docs: /* (non-Javadoc)
  @see com.ibm.jaggr.service.IAggregator.ILoadedExtension#getAttribute(java.lang.String)