public boolean isEmpty() {
		if (this.lowerLimit_ != null && this.upperLimit_ != null) {
			return false;
		}
		if (this.lowerEndpoint_ != null && this.upperEndpoint_ != null) {
			return false;
		}
		if (this.lowerLimit_ != null && this.upperEndpoint_ != null) {
			return false;
		}
		if (this.lowerEndpoint_ != null && this.upperLimit_ != null) {
			return false;
		}
		if (this.entire_) {
			return false;
		}
		return true;
	}