code: @Override
  	public long lastModified() {
  		// return the latest of each of the resources in this aggregated
  		// resource
  		long result = -1;
  		for (IResource resource : resources) {
  			result = Math.max(result, resource.lastModified());
  		}
  		return result;
  	}
docs: /* (non-Javadoc)
  @see com.ibm.jaggr.core.resource.IResource#lastModified()