code: private void convertSingleProductions(String productionName,
  	    ParseTreeNode productionConstructions) throws TreeException,
  	    GrammarException {
  	for (ParseTreeNode productionConstruction : productionConstructions
  		.getChildren("ProductionConstruction")) {
  	    convertSingleProduction(productionName, productionConstruction);
  	}
      }
docs: This method converts the list of productions from a group with a given
  name into a set of productions.
  
  @param productionName
  @param productionConstructions
  @throws TreeException
  @throws GrammarException