code: public String getKey(int key) {
  		if (key == 0) 
  			return Long.toString(this.getEvaluationIndex());
  		else return Long.toString(10000
  				* this.getEvaluationIndex()
  				+ this.getClassifierIndex());
  	}
docs: /* (non-Javadoc)
  @see samoa.core.ContentEvent#getKey(int)