code: public String getAsReference(String attribute) {
  		String value = getAttribute(attribute);
  		if (value.length() < 7) {
  			return "";
  		}
  		
  		value = value.substring(5, value.length()-1);
  		
  		return value;
  	}
docs: Get the attribute value as a reference to another entity
  
  @param attribute The name of the attribute to retrieve
  @return The reference part of the attribute value