public String toString(){
		String str=this.name + " : " + this.mode + " " + this.data_type.name;
		if(this.data_type instanceof ArrayType){
			ArrayType at = (ArrayType) this.data_type;
			str +=" RANGE ( "+ at.starting_index + " "+ at.indexing_scheme + " "+ at.ending_index + " );";
		}
		return str;
	}