code: protected ArrayList<Snak> getQualifierList(PropertyIdValue propertyIdValue) {
  		ArrayList<Snak> result = this.qualifiers.get(propertyIdValue);
  		if (result == null) {
  			result = new ArrayList<Snak>();
  			this.qualifiers.put(propertyIdValue, result);
  		}
  		return result;
  	}
docs: Returns the list of {@link Snak} objects for a given qualifier property.
  
  @param propertyIdValue
  @return